Grossed out by my boyfriend: Any advice?

Okay, so I love my boyfriend and all. He’s my pal and we’ve been dating for more than three years now. While I was studying abroad he gained a lot of weight. He has a really handsome face but it’s the only physical part of him that I’m attracted to since his weight gain. Since I’ve been back from study abroad(3 months), I haven’t had a full orgasm with him, I guess because I don’t find his body that attractive anymore? He also has an issue with personal hygiene and taking care of his living space. He usually doesn’t brush his teeth when I sleep over which grosses me out, and his bathroom and bedroom are always a mess. I can’t walk from one end of his room to the other without shimmying around the junk on his floor. Anyway, I want to voice all theses concerns but I don’t want to hurt his feelings. And anytime I comment on his messy room or something else, he always makes excuses. Long story short: I’m grossed out by my bf, it’s affecting my sex life, and I don’t know what to do. Any advice/ insight?