<human>: Can you give me the gist of the text in a nutshell?

So I realize that much of my situation could have been mitigated had I just ended the relationship at the beginning when I realized I wasn't attracted to her, but I didn't and now I'm at this point and need help.

I'm currently in a relationship with a girl I met on OkCupid. Even from the start I wasn't sure if I was attracted to her physically, but not wanting to be shallow, I went on some dates with her. We share a lot of common interests and she was fun, so we continued dating.

However, the major problem is that I don't want to be intimate with her. I just can't get turned on by her. We tried having sex once, but it didn't really work.

We've been dating for over six months at this point, but I know I need to end this relationship. It's not really fair to either of us to let this continue. 

So, my question is, how do I breakup with her without letting her know I don't find her physically attractive? I know she's going to end up wanting a reason as to why, but I don't know what to say.
<bot>: Need help ending a 6+ month relationship with girlfriend I don't find physically attractive, but whose feelings I don't want to hurt.