Here's that question

Should or Shouldn't you be upset is irrelevant ... you already are ... now what do u do?....
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It's easy to fly off the handle at silly things but remember nothing has happened and he really can't stop people from pressing send on their phones...He is telling you about it and that's a very good thing...When he was torn the previous year he told you about it and pulled away ... very decent and mature not to have tried to juggle with both of you (and u'r feelings) ... let this settle for a little bit and watch for his signals ... if you begin to feel uncomfortable with things try and broach the subject without accusing him in any way of wrong doing...Angie..

I'm here to offer the guy's perspective...
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You know you make this guy sound very decent. He could have played the both of you but he didn't. He was upfront about his feelings for another woman, and considerate enough to not toy with you during the upheaval. As Angie said , none of us can control who presses SEND at the other end of the line. Maybe he did hook up with this girl (after he'd broken up with you) and then quickly realized the mistake he'd made. He's much wiser for that knowledge now., and this knowledge will serve him well next time he has a passing fancy. A really invaluable experience...
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Could she be stalking him now too. Keep an eye on things for a while and eventually once the crisis has passed I'm willing to bet that he'll be ready to tell you. In all this it is important to remember that he was both honest and clear under very difficult circumstances and in the end he chose YOU...
-Carlos..

If your boy friend left you for this girl once already I would say you are completely justified in being upset about them talking, especially if he isn't giving you any specifics. He will probably deny anything is going on if you bring up how you feel about it, but it would be good to let him know that he has already broken your trust so you have a right to be concerned...
I have had a bf cheat on me and he continually told me "nothing was going on" until I walked in on him in bed with someone else. That may not be the case here, but your bf doesn't have a sterling record so far...

I think you have to ask him anout this, don't confront him or start throwing accusations because it could be nothing...Just let him know that you are concerned and tell him your reasons why...If nothing is going on then he can set your mind at rest and if something is then it will give him the chance to tell you...He sounds like a pretty decent guy so I hope it works out!..

Are you justified or overreacting? Of course you are justified. You are justified to beat the bejesus out of your bf. He is playing with you and your feelings. Why cant other people see this? You are going to regret taking him back. Of course you did because he dumped you and your ego was hurt so you wanted to demonstrate to yourself that you could have him and not the other girl. He dumped you because he found a better mental challenge (that's how we men are) and then he regreted his decision because he lost you. So he no longer had the nice things that you have to offer him. You made a BIG MISTAKE in taking him back just like that. The best way would have been for him to really sweat and show you that he deserved to have you back, after weeks and months of begging. In my view you sold yourself very cheaply and set yourself to be dumped again, god knows how many times...