Ohhh. this is a tough one. My relationship with my ex husband started off in the same way (before he began with the emotional abuse, he seemed like a really good guy, which is why i hung on. Even though I had to convince myself to be attracted to his looks. But when you're already starting from a place of MEH, that unsureness turns into something far less affectionate if their personality doesn't hold up.
My friend Taylor has dated and broken up with a "good man" who she's not physically attracted to. Four times. And counting.
You're in a tough situation. Wishing you the best.