How can I get over her?

Uhm. This is what happens when a guy chooses the skanky little b**** over the girl who appreciates everything who just wants to be loved for her. I don't how you could love someone like that. You just fell in love with her lies and manipulative ways. DUH.

Don't always believe exes they do lie and who knows why this happened. Just talk to all parties in fact if you can confront them both together. If she won't let you then you know she is hiding something. I am sorry this happened to you

No waste more than one -grieving sitting on the couch with ice cream watching movies- day ! She didn't have enough respect for you to be honest with you and did that behind your back . It should be a major red flag that she doesn't have good judgment . But I think to help you get over this . Do the things you love to do ! Stay in a positive direction and know . Everything happens for a reason and that you can learn from this to make you a better person !

You should tell her you know all of this ask her if it was a lie ask if she really does have feelings for you make sure you do this in person to know her face expression if she doesn't look you in the eye she mite be lying . Tell her how you feel it is a good idea to know how each other feel ask her what she feels too . Girls are emotional so don't lose your temper if something happens or you mite lose her for life depending more on the girl . Make sure she knows you love her and just wants to know the truth .

Time heals all wounds, and the you have a scar, but now be careful some wounds when you open back up will not be able to stitch

That sounds awful, but her ex may not be telling the truth . You should still be in communication with your girlfriend . Consider telling her (in a calm manner) what that person told you, and asking if it's true . If she denies it, say that you want to hear the actual truth, even if it hurts . (You have to consider that if she's capable of cheating, she's probably also capable of lying to get you back . )

If it turns out that she was cheating on you the whole time, you should rest easy knowing that your decision to break up with her was the right one . Don't stick around if you know what's good for you, otherwise you may be setting yourself up for another incident .

Try talking to her about it . I think if you are able to sit down and tell her how you feel and try to get her to lay her cards on the table completely, this could get sorted out . It probably won't be easy since it turns out that she possibly didn't end her previous relationship . That should be one of the cards that you should see if she lays out . If she doesn't lay out all her cards, then you should probably challenge the level of trust and honesty between the both of you .

In any event, I feel a break-up might be good for both parties . If the break up was over her not knowing what she wants then let her figure it out alone . I don't think you should hang around as her boyfriend while she figures out what she wants . Let her do the figuring without the expense of your heart . As for what you should do: I think its best you let her figure it out alone and try going it alone for a couple of weeks (or however long it would take for you to recuperate) and keep in touch with her to see what happens . .