Just to give another perspective. I do think you can be friends with her. A child seeing both their parents together is a HUGE deal. If you stop all "non-friend" contact and especially if you find someone else you get over her. It's possible you may never but that would be the exception. Do you still have a good time spending time with her without the possibility of physical contact? If so, why do you have to stop? Do the pros out weigh the cons? I mean being great friends with the mother of your child is different than just some random girl. However, word of caution, odds are once you start seeing someone else romantically she is not going to like it. Good luck.