She broke up with this ex for me, and has said that she is totally in love with me, but I feel really insecure about the ex boyfriend. How can I convince her that I'm the only one she should ever be with?
It looks like you should really give her some space. If she's got a lot going on right now, the last thing she needs is you being clingy. Give her some space to breathe and decide for herself whether she wants to be with you.
I would say that if you guys are really young (like high school aged) than you should move on...
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