I managed to meet up with a girl who I gamed at a nightclub in Ottawa, Canada recently but she gave me a pile of shit tests.

First, she flaked last minute on me and told me she lost her phone, I didn't believe it but I met her at soccer the next week. After soccer, she said she needed to go to her locker. On the way she snaked through the entire massive sports complex, and talked to about 15 guys with me there, they knew each other in one way or another but I had to follow her to her locker.

I just stood there trying to talk to her guy friends a bit but it was difficult to get into the conversations. What do You do if that happens?

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"Always desire to learn something useful." - Sophocles

I forget where I saw this, but I remember someone saying "Aren't you going to introduce me? That's the polite thing to do" in a semi-joking manner tends to work well. It'll probably make her laugh, but also will ensure that she introduces you and includes you in the conversations from then on. At the same time, you're not coming off as insecure or clingy. Personally, I've never really had this situation happen to me so don't take this post as the be-all end-all solution to the problem.