I'm lost in this marriage...?

I'm so unhappy in my marriage. I just don't feel compatible with my partner at all. I feel like we're compatible of a friendship level but no further. I'm not particularly attracted to him. This is bad and really hard. We bicker like cats and dogs. I know I'm completely unfulfilled and I'm pretty sure he isn't really either. For some reason he wants to stay married to me and is happy with me but that seems unfair to me that I'm not happy with him as a partner. I sometimes feel like we're married just because he wants to be. We've talked about this.