Son has signed out

It sounds to me as though your son has a problem in his own life and is lashing out at you instead of seeking help to resolve this.
It's painful for you but hopefully when he is in a happier place the relationship with you can be restored.
I don't think there is much you can do except be patient.

Hithere

Your son gave you a gift - his side of the story and what you could do to improve the situation

However, his reasons are not good enough for you (as if you are the judge of that) and "he broke the family" - read with sarcasm

Horrid response.
The OP has admitted to being her harshest critic, most parents are. And if the son’s siblings are sticking with her and showing their support I can safely say she got it right with two them. The third is lashing out as can often happen with young adults. Am hoping that in time they will reunite 🙏🏾🙏🏾

If you call that a ‘gift’ it’s not one that anyone wants Hithere.

Hithere

Your son gave you a gift - his side of the story and what you could do to improve the situation

However, his reasons are not good enough for you (as if you are the judge of that) and "he broke the family" - read with sarcasm

This is a vile post...what sort of person writes this ?

Could you ask him (via a sibling if necessary) if there is anything you could do to repair things? It would then be up to you whether you did it, but at last you would know what he's thinking.

I feel sad for OP. It sounds awful.

Easier said than done but perhaps a cooling off period?

I wondered if it was me who had misunderstood Hithere’s post!
Obviously not - totally uncalled for.

What a sad, damaged person you must be to be so full of bile.

Hithere

Your son gave you a gift - his side of the story and what you could do to improve the situation

However, his reasons are not good enough for you (as if you are the judge of that) and "he broke the family" - read with sarcasm

Nasty, sarcasic, post. He gave his reasons, why should OP admit to something she considers untrue?The other siblings also feel alot of it is unjustified.
I notice with alot of your posts hithere you always side with the adult offspring and get very brusque with the OP. Maybe look to yourself.
I am not a estranged parent by the way.

Your son gave you a gift - his side of the story and what you could do to improve the situation

However, his reasons are not good enough for you (as if you are the judge of that) and "he broke the family" - read with sarcasm

So sorry you are going through this. The good news is that even though your son is blanking you this has only been since Jan, and I know it feels like an eternity right now but it really isn’t, there is still time for your son to come round. You mention your other ACs, his brother and sister, have they any idea why he is doing this?
My advice would be to simply send an email or letter saying you understand that he needs space right now but you are there if he needs you and that you love him very much. And leave it at that for now, get on with your life and try to fill your time with things that you enjoy which will distract you from this situation, as well as holding those who are still close to you even closer.
You can’t force this or change it your son is a grown man who has made his own decision about this for now.
Wishing you well
🌹🙏🏾