My ex and I dated for 5 years before he left me for another woman. I finally started dating someone new a year later, and I was happy for a couple months. The more this relationship progresses, the more I think about wanting my ex back. I feel really bad about the whole situation because I thought I was ready for a new relationship and had no intents of using anyone and now I feel like that's what I've done. My ex is still happy with the other woman, and I don't think he's ever going to even think about me again, but I can't stop thinking about him. And I'm with somebody new who couldn't possibly be any better to me, and I feel terrible for not being able to appreciate him more. Will I ever be able to let go and be happy with someone new? I've done all the right things: spending more times with friends and family, getting in shape, going out more and having fun. How can I move on and just be happy with now?