Let it go for a few days, as hard as that may be. Yes, even if there is no A yet, an EA could be going on, but you're right hanging out w/ some other guy that's making advances is wrong if you are in an R w/ someone else.
Let her chase you -- let her wonder what you're up to. Go to the gym, do something, just get out of the house and do something so you're not dwelling constantly.
You're going to have to get yourself back either way -- whether she comes back or not. She's not going to come back if you are desparate, etc. Make her want to come back.
Me: 38 H: 35 S4, S5, S10 Bomb 01/07 Wanted D - nothing would change his mind Numerous A's prior to D bomb; EA prior/during D bomb Piecing 04/07 Deployed for a year 05/07 Still Piecing 2010 M 11 yrs 05/10