<human>: Can you summarize the given text in a few sentences?

My friend and I started talking to the same girl in OKC and found out about it one night, laughed it off, may the best man win kind of thing. Well I took her out on a date, but she ignored me afterwards when I tried to set up a 2nd date. Which is totally fine; I get the hint. My friend, on the other hand, is a lot more successful (happy for him) with her. Anyway he invited her to this concert that we've been planning to go see for a while now and she does not know that we know each other.

I'm no longer trying to date her or anything and I definitely want to see my friend succeed with her, but I just can't help but feel how awkward it will be when she realizes that I'm best friends with the guy she is dating. Any ideas on how to make it less awkward when the three of us finally meet up?
<bot>: best friend and I dated(ing) the same girl on OKC. gonna go to concert with both of them. she does not know we know each other. awkwardness will ensue?