Face the facts. He IS going to have custody, even though it is entirely possible that visits with him will consist of him hiding in his room while the kids watch TV downstairs.

Hang in there! This is a difficult situation for you and the children. Is there any way for reconciliation? Have you considered speaking with a counselor? I believe the marriage can be saved especially if both people are involved and willing to work for it. Communication is key.
Good luck! I wish you all the best.

PP from above here: ^^^^

Is there any way that one of you can maintain a second residence?

Since you two are about to legally separate then it makes some sense that he tries his best to not be around you at all.

To a certain point.

However since you share mutual children, then I think he should spend less time in his bedroom alone.

Sure....
He could very well be depressed.
After all his love life is not working out.

You can always encourage him to seek help, but it must be something that he wants to do for himself.

Hope this helps.