So what would my life be like if I left my husband?

I moved out twice already, but I obviously came back. I used to say that even if I couldn't stay with my husband I would never marry again, because I still love him and am committed to him even if I can't be with him. But I'm tired. I'm tired of being the only one fighting for this marriage. I'm tired of feeling worthless and ugly. Most people have told me that I have every right to leave him, so what's keeping me here? Is it really my loving commitment to him? or is it just fear of being alone?