Are women really not into nice guys?

I don’t really know how to start this and I don’t want to sound like a total a hole. I met this guy last year during a really difficult time and I let him know when I first met him that I was not in the frame of mine to be dating however, he still wanted to remain friends and we have talked gone out to the movies gone out to dinner Twice. He did buy me a Christmas gift that was pretty expensive however, I feel like he keeps pushing to want a relationship. He wants something more and I just don’t feel like I am attracted to him sexually I feel like such an asshole because he’s a really nice guy However the sexual desire just isn’t there. Yet a guy that I have been on and off with for the past two years who has commitment issues briefly mentioned something about us being together, and I will admit him mentioning the thought of us building a relationship excited me , when it comes to someone who is emotionally available and Willing to make it work, it’s like I’m turned off what is wrong with me?