I don't have any advice on how to get him out, changing the locks seems like the easiest option since the house is in your name, but I would talk to a lawyer especially with how he's been acting because you want to keep you and your little one safe! I'm sure you've done this, but separate all your money and get a lock box and put everything you can into it. I'm sorry you are going through this, but I'm a single mom now and I can tell you it's a lot easier than being in a two parent household with an addict. Hugs! Just remember to ask others for help when you need it!