Boyfriend Troubles...

So..my boyfriend and I dated last year in June before breaking up in November..then got back together in March for about a month..then in June this year we got back together and are still dating. It's because first, my dad hates his family, and doesn't like my boyfriend at all. Second, I just kind of lose feelings almost.. I feel like a horrible person, because I'll catch feelings for another guy (I don't cheat though.) or I'll just sort of fall out of love, before I see him again and fall back in love. His dad lives in my town, so he only got to see me very rarely. Thing is..it's happening again and I'm so scared. I don't know what to do. He tried committing suicide in early June because he said there was no point living without me in his life. He always tells me how much he loves me, how much he's thankful I'm in his life, how he couldn't stand to live without me. This makes him sound like the controlling, clingy type but he's really not.. He's just so in love and I'm not anymore.. I'm terrified of what would happen if I tried breaking up with him. Or if I ended up getting more feelings for him after ending it again. This cycle isn't healthy for either of us and I'm just scared. I need help..