The easiest thing I can tell you is that it's irrelevant to you and her now because you two are broken up. You should accept the fact that she's no longer in love with you. The hardest thing is accepting that and really moving on. I think what you really want is clarity, but listen to what she told you. She's not in love with you anymore, which means that regardless of a rebound relationship or if she'll be single for the next 2 years, she's not coming back to you. Sometimes clarity is never achieved because you won't get what you really want out of it, which is her. I apologize that she did you wrong. The fact that she's even looking at other guys is showing that she could've been emotionally cheating, whether it was physical or not.
I recommend that you stop having sex with her or else you'll just continue the viscious cycle of going crazy. Trust me, I've been there. Go out, meet new people.