<human>: Can you condense the text into three sentences or less?

We've been dating for close to half a year now. She's known this coworker (John) for much longer than she's known me. When we first started dating she told me he was taking her to a beer festival. They had it planned out since before we met. I still felt weird about it, so I let her know that it kind of bothered me, but I was still okay with it since they've had the plan for awhile.

We live a couple hours apart so I've never met the guy or been around them both to accurately get an idea on how they act to each other, but she has periodically sent me screenshots of random conversations between them. I've never felt right about how he talked to her even just through text. I've let her know that and she's assured me that they're just friends. I said whatever but I still felt weird about it.

 She told me that she would stop talking to him as much if it really bothered me and that made me feel better. I thought we were good, but fast forward about a month or so later and she just told me he asked her to go to some concert with him. She asked me if it was okay. I'm pretty shocked she would even ask that after knowing how I feel about the whole situation. I basically told her this and she flipped it back on me, saying I'm being a child. I told her if she wanted to go to this concert so bad she should just buy her own tickets, then she says she thinks they're sold out. I know she was being kind enough to ask me if its okay if she went, but even after I said no she seemed to not be satisfied kept asking why. 

I'm not sure if I'm being unreasonable with this or not. I feel like if she's really in love with me like she says this shouldn't be a problem. I wouldn't have an issue if she was going with a female friend. The fact that it's a guy and it's just them two going really gives me a weird vibe. I need help.
<bot>: Girlfriend is hanging out with male coworker that she knows makes me uncomfortable, just became very hostile after asking her to not go to a concert with him.