Boyfriend going to a concert with another girl?

Anonymous
So, my boyfriend is going to a concert with another girl. He claims she's just an old friend, I've never met her, but then again we're long distance. I probably wouldn't have had a problem with it (okay, I wouldn't have been HAPPY about it... but I would have accepted it) except that I didn't find out he was going with her until she tagged him in a Facebook post proclaiming that she's pumped about the concert tomorrow night. When I, calmly, confronted him about it, he told me he didn't tell me because I "didn't ask." Which only made me more upset. So, I continued to try and rationalize it verbally with him (asking questions like "don't you see how me finding out that way feels shady to me?") But he hung up on me like a 13 year old girl. Am I really overreacting? In my opinion, the omission of the details is still a lie.
Boyfriend going to a concert with another girl?
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