<human>: I have been friends with this girl for a couple of years, and recently (within the last couple of months) have started to talk to her more and more. We started going out regularly with each other about two or three weeks ago (parties, dates, etc.) and have hooked up a couple times and I thought it was going great. 

She suggests we go to a concert this weekend together, so I did. We went out on Thursday but then by the concert on Saturday she was completely different. She still acted friendly with me, but that was it. Then she started getting really flirty with other guys we were hanging out with, but continued to just treat me like a friend and nothing more. 

She has texted me a couple times since then, but has always killed the conversation.

Summarize the given text in a few sentences.
<bot>: Girl and I are/ were dating, just when I thought things were going great she completely backs off and I have no idea what to do.