Need advice

I have been considering leaving my fiance and we're supposed to get married in September. It's to the point where i even bawled my eyes out and broke up with him on night and the next day just decided we should start from the beginning up. We moved to another state to get a fresh start then shortly after we moved we found out his dad has stage 3 inoperable lung cancer. That along with other stuff going on has him so stressed out he takes it out on me . not physically so don't be alarmed. But we spend our entire life surrounded by HIS family and HIS friends and i never get to see mine. Every time I try to talk to him about it it's like it goes in one ear and out the other. Nothing ever changes. I'm about to move back home and pay my parents rent for their basement I'm so fed up. And excuse any typos, new phone!