<human>: I have found myself trying to find a reason to break up with my boyfriend of 3 years.  I really want to break up with him but am having a hard time finding the courage to do so.  I know that I need to do what I need to do for myself to be happy, but I still don't want to hurt him because he is just such a nice guy and we've lived with each other for 2+ years.

He makes me dinners, treats me with respect, is an all-around very very nice and loving family guy.  However, we've had some fights in the past because we don't have that much in common.  To the point we have a hard time finding the right movie or music to watch/listen to because our likes are so different. We've gotten used to it, but I feel like this has ruined some of my attraction to him, while he's learned to adjust. I've also felt weird about the way we communicate -- it's hard to explain, but I just feel like the vibe we have together doesn't feel right when we communicate.  I don't think he notices this (which would make breaking up even harder to explain).  I think one thing that attracted me to him in the first place was that he was such a downright nice guy, loyal, faithful, family man, etc.  He really doesn't want to hurt a fly.  Contrast that to my last relationship where my bf cheated on me continuously and you might see how we ended up together.

Lately, I've been so (uninterested?) that I've been turning down his advances for sex.. I'll sometimes avoid the bedroom until he goes to sleep just because I don't want to have sex with him.  It hurts me to do this to him, but at the same time I just don't feel that interested. I find him physically attractive but my mind seems to have a disconnect. 

Any advice on what to do in this situation?

Can you give me a shortened version of the text?
<bot>: Becoming uninterested in my bf even though he is a stand up guy.  Want to know how/if I should break up with him.  We live together.