Boyfriend and I are trying for a baby and he's still legally married a 3 years later

Me and my boyfriend are trying to have a baby and he is planning to marry me once he is officially divorced. this divorce has been dragging for 3 years because they can't come to an agreement on splitting assets. They're trying to keep it out of court. He's been living with me in an apartment and his ex is in HIS mothers house. It's a huge 6 bedroom and it's a piece of his mom because it was her mother's house and his ex wants it. How things are set up here the wife can get everything in a divorce so they are trying to handle it themselves. His mom was also killed in that house by his abusive step dad who left him to die. He was beat most of his childhood. He's been fighting with her over this house for 3 years and today he says he's done and just gonna give it up and he doesn't understand why he's fighting for a house he has no good memories in. I don't think that's a good idea because 1. It's a family house and 2. We are trying to have a baby and could use more space. I don't think we should give up on this house but he seems over it. He has no good memories from childhood there and the memories from when he lived there married are pretty miserable too.

Edit: No. He has no kids with her.