"I don't think anyone should have to move out of their home simply because someone else decides to be a pushy boar."
That is true, but the reality is that, too often, joint ownership of a home by people who aren't married to each other is a bad idea. There are too many issues that cause problems, who pays for repairs, who spends the most time, having guests, privacy, payment for and use of food and items in the common areas, children, pets, how to get their share of the money out of it if one party no longer likes the arrangement, or has to move to another area. I just think you're better off having your own place, even if it isn't as nice.
The OP's husband is paying half the mortgage, but what are his legal rights to the money he is investing in this place?