Not allowing access to my emails -AIBU?

I would tell him, 'No. You betrayed my trust once. I'm not trusting you with my private information again.'

Just honest with him. He won't like it but it's his own fault.

A Kindle Fire will provide all he would need. On offer on Amazon and cost him from about £44.I
But this is the least of your problems

=LeaveTheBarstool.

is he disabled, if not why are you running around after him, buying him mouses, inconveniencing and stressing yourself over all this.
as for the various options and enabling, it reminds me of the rhyme, soldier, soldier won't you marry me...
so off she went to her grandfather's chest and brought him a pair of the very very best, and the soldier put them on.
i bet he did, fully kitted out, and off he went, only then mentioning that the reason he couldn't marry her was because he had a wife and childer at home.
as they say so succinctly on MN, LTB.

You have summed it up Madgran77 - thanks for that, and to everyone else.

Doesn't really address the problem of OP living with an abusive, manipulative control freak though does it?
Personally, *SJ23 this would be a deal breaker for me. He'd have to go. Permanently.*

I agree with Chewbacca. This would be a deal breaker for me too. Completely unreasonable behaviour.

Your emails are not of his business.

Thanks SO much everyone for this. Sometimes it helps to see things from the outside - when you're in a situation you can't see the wood from the trees. Actually after all the fuss, and my having supplied him with - and bought the mouse for - the Chromebook in an effort to keep things calm and be a total people-pleaser, he then told me he didn't want it anyway and was going to take some more time to think about his 'urgent' email. Aaagh...! I will think about what you have said

I have no access to my chap's computer but he willingly "logs me in" if necessary. His email section is separately & differently passworded but I'd never even bother to look anywsy. Likewise, my laptop has a separate password to log in & different one for email access. If my chap uses my laptop he goes onto the internet & picks up his own email provider/emails via that route. Doesn't need to go anywhere near my personal stuff. Anyway, we trust each other & however cross I get with him, I'd never discuss him with any third party via email!!
Your man's behaviour is unreasonable & he sounds like a bully. You know what you need to do! Maybe not now but eventually you will. You'll see.

The only reason he wants to use your computer again is because he wants to access your email and your files to check on what you are doing.

If that was not the only reason he would have done one of the things that Feelingmyage55 listed.

His behaviour is abusive and good for you for standing up to him. But you need to consider why he wants to read your emails and files and whether, he can, himself, be trusted.

Say it how it is MaggieTulliver made me chuckle but seriously you are so right.

This sounds like an ongoing trust issue SJ23 and if its symptomatic of your relationship I would be thinking of making big changes. We all need privacy, our partners are not entitled to know our every thought or deed. My husband will carry my handbag downstairs for me to get something out of it rather than look inside it.
You are definitely not being unreasonable

I agree with Grandmabatty. You need to think about the wider issues, if you haven't already. Sorry, but I don't think it's helpful for people on the Internet to say 'leave him' without knowing the full story, which is often complicated and messy.
It's real life for you, where actions have consequences - not a theoretical situation that disappears when you close the computer.

I suppose if you wanted to you could offer to access his emails for him, and when he refuses, point out that the reasons he doesn't want this are the same as the reasons you don't want him accessing your computer - privacy.

There is nothing wrong with people in a couple having their own lives and privacy, and it strikes me as unreasonable of him not to recognise this.

You have offered three possible solutions
1 Recommendation of suitable model to purchase
2 Loan of your chrome book as guest user
3 Help with setting up new password.
I can see no reason to reject any one, never mind all three options.

I’d be tempted to add others. Use the public library/computer cafe/his phone. In other words “not your personal appliance”. You know he might snoop. I guess there might be other private emails/financial statements you’d rather not share, rightly so. Perhaps that is adding to his unreasonable reaction. Can you reset your passcode and password to prevent his using your computer? Is this problem in fact a symptom of relationship issues, not a standalone argument?

What do you want to do? What are you getting out of this relationship with him now? It sounds like there is distrust on both sides and it's very difficult to come back from that. Would this be the last straw in your relationship? If so, then you need to communicate that to him. He sounds very angry and is perhaps feeling frustrated but we don't know him as well as you do. When he behaved badly before, how did you resolve it? Or didn't it really get resolved? How much do you want the relationship to continue?

Chewbacca has hit the nail on the head.

Can’t you set him up with a separate log in on your computer

Doesn't really address the problem of OP living with an abusive, manipulative control freak though does it?

Personally, SJ23 this would be a deal breaker for me. He'd have to go. Permanently.

Can’t you set him up with a separate log in on your computer? He won’t see your files then. He sounds like an arse.

If partner was snooping around your computer three years ago, at a time when you say "he was behaving very badly" - badly enough for you and his sister to have been discussing it - might the so-called urgent emails then just have been an excuse to do just that, to snoop, for some reason?

I hope you have good secure passwords that he doesn't know on everything, especially on financial things such as bank accounts.

I apologise if I am reading more into his behaviour than actually exists, but it sounds rather suspicious to me.

To be honest he would be my ex partner by now,

Cursing and swearing at you and accusing you of things to hide? He sounds like a total twat - why are you with this man?

SJ23 it is your partner who is unreasonable. He is reading your private e-mails, cursing and swearing when he doesn't get his own way.
I would not only deny him access to the computer I would deny him access to the house.

I d say ‘goodbye‘ no trust no relationship

It sounds like what happened three years ago hasn’t really been resolved. There is no reason why you shouldn’t let him use your computer, apart from the fact it went wrong before. You were emailing his sister behind his back, which I get if you were trying to sort something out, but why not the delete everything, once sorted.....or has it never been sorted? I’m actually wondering why you’re still together. Perhaps a bit more information would help. Sorry if I sound blunt.

No you are not being unreasonable. He broke your trust by accessing your personal emails, something he should never have done.

As for your partner "demanding" to use your laptop and cursing and swearing at you, if he was my partner he wouldn't be using my Chromebook either.

If it were me I'd take my Chromebook back and suggest he go out tomorrow and purchase his own laptop.