<human>: Throwaway.  Long one.  Apologies.

We've been together about 10 months.

We had been friends for about 3 years before we began dating, but after having a few dates, we decided to officially date.  The day after we began dating, she was out with a few friends, and when she returned home, we talked about how each others' days were, etc.

She mentioned she hung out with a guy, a guy who she had gone out with a few times, and had a minor fling.  I wanted to keep cool, so I said, "Oh...that's interesting."  She then told me about how the other guy had seen us walking down the street, holding hands, and asked who I was, and her response, "I told him that it wasn't us."

I took it badly, and we had a long talk about it.  I told her that I felt as if she's insinuating to this guy that she's still single, and discounting me and that sucked.  She apologized, and said that she just likes to keep her life private, and told me she would tell him that she had a boyfriend the next time she saw him.

I guess the insecurity stems from that issue, and her wish to keep her life private from other people.

Now, whenever she goes out with other guys, I feel uncomfortable knowing that none of these guys know she's taken.  Last week, a coworker (who has the nickname of "office creep") asked her to dinner informally, and she said, "Sounds good," without actually planning on making plans with him.  This somewhat triggered feelings of what had happened previously, and it put me in a bad mood. 

How do I get over that initial event?  It's been coming up every few weeks whenever a guy takes an interest in her, instead of saying, "I have a boyfriend," her go-to response is to drag it out and not reply to them.  It's making me feel pretty insecure, which is not something I'm used to.

Whew, sorry for the long post.  Thanks for reading.

Give me the gist of the text in a nutshell
<bot>: Girlfriend did something at the beginning of our relationship that made me feel like crap.  It sowed a seed of insecurity that hasn't gone away after 10 months, and it sprouts up every now and then.