<human>: Condense the text into a few key points

Hello everyone.

Me and my boyfriend have been together for nearly a year and a half. 3 weeks ago, we nearly broke up. There were some problems with perceived disagreements about me fitting in with his other friends, and some other issues that we hadn't communicated well enough about.

There was however one thing he told me, which was that two weeks before that discussion, he had been in a sort of training camp for a youth group. During that camp, he met a girl. One night they were dancing. That made him think that it would be wonderful if he could do the same with me. (I do go out and dance, but rarely have the time. He goes out a lot more often, but on weekends and because of restrictive parents I can't see him on weekends. That made him think I really don't enjoy it. It's not my favorite thing to do, but I like it every once in a while.) He also told me that was the first time he began to think about what a relationship with another girl could be like.
He then said that he had arranged to meet up with this girl again next week. He didn't tell me about it, because he felt it wouldn't be proper to do this while he doubted our relationship. 

We talked everything out, and everything is fine, except for this one thing: I still feel very insecure because of what he told me about that other girl. (They never met up, btw.)
Nothing happened between them and I don't think (he also denies this) that he even had as much as a crush on this girl. However, they still talk on facebook occassionally. 

Am I overreacting for still being insecure? How do I let this go? I don't know whether I'm insecure because of the girl or because it was nearly over and I didn't see it coming.
<bot>: Boyfriend and I nearly broke up, am I insecure about either a girl with whom nothing happened or the fact he was willing to break up?