It’s very normal for you to feel this way for a few reasons. As I recall, your first boyfriend kind of broke up with you out of the blue or at least you felt like he did. It wasn’t a mutual breakup, so even though you have a new fellow that you really like, it still feels kind of awful to have been broken up with, when you didn’t want that in the first place.
The other reason it feels so awful, is because that guy was your first boyfriend, not your 3rd or your 20th. The first one will always be a guage in which you compare other situations.
Another reason, is because your ex kind of hid this information from you by not taking your calls. He may have wanted to spare your feelings, or he may have felt guilty, but either way, he was kind of secretive about it and that always sucks.
And somewhere back in the recesses of your mind, even though you don’t want to get back together with your ex, part of you still wishes that it could have worked out. It’s still a loss, no matter how you look at it.
A lot of people, myself included, find the idea of being just friends with an ex, an especially repulsive idea. If I was in love with a guy and then we broke up, whatever is left is always going to be less than ideal and most often is something really unpleasant. You are never really just friends with an ex, even if you want to word it that way. One person is always going to be the dumped party, and that in and of itself can be humiliating at worst, and just plain sad at it’s best. The other person may not think of you at all, or he may not give 2 sh*ts about you anymore, or he might become overly friendly in an attempt to negate the fact that you were a couple at all or he might want you to become buddy buddy with his new girlfriend so that he won’t have to feel bad for breaking up with you (as though he’s doing you a favor). For me, any of those options is just plain horrific and I’d rather not see the person or have any contact with them, anymore. But that’s just me.
It’s good to outwardly let him and everyone else know that you are happy for him that he’s found someone new, but it’s also OK to feel sad and crummy about your breakup with him, even though those are two separate things. Just try not to let your new boyfriend know that you still feel sad when you think about the breakup. It has nothing to do with him, but he’s likely to think that it does, or that he somehow doesn’t measure up.
If you have to see your ex, for whatever reason, just plan ahead for what quick, polite response you will give him and then make for a quick, polite exit. Always be cordial and nice to him and to his new girlfriend. And if you’re new boyfriend is with you, be polite and kind to him too by introducing him as “My boyfriend, Rex” so it will be clear to all parties who he is, but don’t flaunt it, and don’t allow yourself to get engaged in much more than a quick polite sentence or two with the ex (whether you’re alone or with your boyfriend) But if you’re sweet and polite and don’t have an ugly scowl or sad frown on your face when you see her you will look like a class act.