In laws trying to drive me out

Ik what every one will say your not marrying the in laws your marrying their son. And it’s true. However our relationship has been special. At 18 I was kicked out and with my last semester of grade 12 just starting and nowhere else to go I moved in with my fiancé and his family. He’s been applying to colleges and also working a full time job since we’ve graduated. All was going okay until some money went missing in the house. Immediately they assumed it was me. My fiancé obviously didn’t think it was me. But ever since then his father has been hinting at Gabriel finding a better girlfriend and how im not good enough for his son. I’ve been with him for 4 years now so I know that it’s never going to happen but it’s so frustrating because I’m trying my best to ignore his rude comments towards me but it’s really starting to bother me. He is constantly calling me a b***** and saying that I look pregnant due to the fact I’ve gained weight since starting my new medication. I really want to move out but with me not being able to work due to my health and him wanting to go to college it’s really hard to do so. Any advice to handle a in law that hates you and is trying to spectate you and your so would be awesome