Husband talking to new love in the house while I am there?

Yes you are being unreasonable. It’s half his house too. He can make phone calls to whoever he wants.

I think you are being unreasonable to be honest, you have been in this situation for 10 years!! So I’m not surprised one of you has got another relationship, he isn’t talking to her in the same room, I wouldn’t expect him to go outside to ring her, you are going through a divorce after all,

I feel for you Helleborus. Your post has brought back some very painful memories.
I had to bear the humiliation of hearing my husband declare (on the phone) his undying love for his mistress (now wife), while I was in the same room. Leaving brochures of houses they were planning to buy together.
I can go on, but it hurts to remember. I tried my best to save the marriage but you can't clap with one hand .
In your case, it's sort of a mutual understanding, but I guess it still hurts. All the best for your future !

I think this is the difference between most men and women.
A woman would not feel comfortable making the calls in earshot of an estranged husband.
A man doesn’t care who can hear.

I agree with Maw. It is still your Husband5’s home. Where is he supposed to go to phone?

I agree with oopsadaisy3 to an extent as you are leading separate lives and about to divorce. However it is a bit insensitive of him to conduct such long conversations in your shared house. Is one of you going to move out soon ? If so it may be better to expedite this so you can both get on with your lives. It's always hard to separate after such a long marriage. I hope things work out well for you.

If you have been estranged for 10 years what do you expect?
I can appreciate how hard it is for you, but you must both be ready to move on. One of you was bound to start a relationship sometime.
So I am afraid I think YABU, but I would blame the practical living arrangements, not the person.
Perhaps you could be out when he is entertaining, but if you want an adult “sharing” set-up with no more strings, it has to work both ways.
You cannot be a “dog in the manger” and I would not agree he is behaving like an adolescent.

I think it must be hard even though you are separating. I take it you are just Sharing the house till the divorce? You both want to move on but it must be really hard still seeing each other everyday.

I really can’t see a problem, you are living separate lives, like a house share.

So I think YABU . At least he’s taking the call in separate room.