being caught in the middle

Alright ladies I'm in sort of a pickle. So me and my daughters father were together for almost 10 years and in august he told me he didn't love me anymore like he use to and just needed space. I was desperate to make things work but he wouldn't budge. I finally respected his wishes and gave him space. And in that time I started talking to one of my close friends, and before I knew it I started liking him more and more and we hooked up. My ex finally came around and said how much he missed me and my daughter and he realizes what he was losing and he wants to try to work things out. Of course I want my family to be together and whole again but at the same time I really like this other kid and don't want to let him down. And don't get me wrong the sex is amazing with this other guy, and with my ex, well it's ok but it's not like it was before. Now I'm very self conscious when I'm having sex with him because he told me he had sex with another girl and that just made me feel different. And I can't get mad or crazy about it because we weren't even together and I hooked up with someone as well. I'm just not sure how to go about this whole situation. Any help??