Boyfriend took another girl as a "date" and I can't let it go?

Anonymous
My boyfriend and I were on a 'break' for a while, but still exclusive...as far as I know.

We still acted as though we were a couple, just without the title.

Well, he ended up taking a girl with him to his Military Ball. A few days before the ball, he told me he wasn't taking anyone, and left me to believe he was going solo.

After about 8pm, he stopped replying to my texts. The next day, I found out via facebook that he took a girl with him to the ball. When I confronted him, he didn't deny it, but I could just tell that he was hoping I would not find out, ya know?

Well, I can't get over this.

He's been in the Military for 5 years now. In those 5 years I was the first and only girl he took with him to a ball because he said "no one else was worth taking" basically. Yet, he ended up taking her this past year...

So, I feel really hurt & betrayed. I felt special that I was the only one he had taken, it meant a lot to me. He knew that.

But he still took her claiming "he didn't want to be the only one dateless"...

It may seem like I'm over reacting, but this girl pops up every now and then, and him and I are in an LDR. I'm really not sure what they have done/if they have done anything. He continues to claim she is only a friend and is friends with all his friends.

I really don't know if I should be concerned. He accidentally called me her name during Christmas when he was visiting and completely wasted, and I saw an email from her on his phone that said something along the lines of "hey, I miss you, come to my birthday shindig..."

But, since then he has made us "official" again, got me a nice, meaningful Christmas gift, and has casually began mentioning me moving down there. But it's all talk as of now.

I don't know how to tell if his heart is honestly into our relationship, or if there is something going on with this other girl or just with him in general.

How do I tell? I don't know what to think and it's beginning to destroy my emotional stability because I always assume the worst and convince myself it's true with the littlest bits of evidence.

What do I do?
Boyfriend took another girl as a "date" and I can't let it go?
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