Assuming you aren't married to him, you most likely own the house as tenants in common. Has he contributed at all to the house, or was putting his name on it a gift?
I suggest you contact a lawyer to find out what your rights are. Depending on the circumstances, you might be able to extricate yourself and keep the house.
Talking to a lawyer doesn't commit you to anything. It does help, though, to know what your options might be.
Have you ever talked to your partner about what would happen with the house if you wanted to split up? Would he be amenable to a financial settlement to give up the house? Just things to think about...