I'm concerned about my girlfriend going to a concert with her bestfriend.?

Anonymous
Okay so my girlfriend is going to a concert with her bestfriend and its a lesbian band and what not so before we started dating a guy 'came' onto her at another concert while she was dating MY bestfriend I found out as we were dating and she told him. Now the thing is I can't tell if she's lying or not she was alone so what she tells me, I basically have to believe.

So the problem is that what if a guy or girl 'comes' onto her and starts kissing her like the guy at the other concert and she doesn't tell me?

I'm not going to stop her from going but i'm worried about her ya know?
I'm concerned about my girlfriend going to a concert with her bestfriend.?
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