advice please

hey ladies.. I could use some advice. so recently I've noticed that my boyfriend has become less affectionate with me and it always seems like a hassle for him to kiss me or cuddle me and things like that. I know he's not cheating (100% sure) and Im just not really sure what to think. whenever I bring it up, he says he doesn't want to talk about it or he doesn't really say anything back and then just changes the subject. Tonight we got in a really big fight about it and still nothing has changed.. I love this man with all my heart but I'm getting tired of having the same argument and nothing changing. keep in mind that we live together and have been together for over a year so its not so easy to just up and leave. What should I do? I've tried everything to be more romantic and act more like a couple but nothing works.