If I could have her back, would I?

Okay heres the backstory: I'm still in love with my ex girlfriend. We dated for only about 3 months but we fell hard and fast. We had a very deep and intimate relationship both emotionally and physically. A lot of the time I think she truly is the only one for me. She broke up with me about 6 months ago because she was still in love with her ex (but she told me that she didn't have time for our relationship and that she needed to focus on other things). She and her ex got back together and dated for a few months and apparently it was serious and love but her ex is going off to college while she is staying here so they broke up a few weeks ago. Me and my ex are friends again on the surface, she apologized and I mostly forgave her because I missed her friendship. But the entire time she was I couldn't get her off my mind. She truly broke my heart in two and I hit rock bottom. Now for my present problem: I've finally accepted myself as a person worthy of other people's love. I was the best girlfriend I could be for my ex and she thought she could do better so that's her loss. But now I've started to talk to someone new I'm interested in but also hanging out with my ex. I've been waiting for months to see if she would want me back, but I've gotten nothing and I deserve to be happy. But I don't know that if she did ask me back that I'd be willing to hurt the person I'm interested in now for her and look like a complete tool. I can't wait around for ever, but I don't want some relationship that gets me over the hill until my ex asks me back. What should I do? Keep waiting, accept that she's not asking me back anytime soon, date this new person, or something else? Ill always be in love with my first ex, but should that hold me back from me trying to make myself happy, or does that just hurt the other girlfriend that would get involved and is a selfish move?