My girlfriend invites her guy friend to the concert, but not me?

Anonymous
Both my girlfriend, Emily, and I are 23.

We have been together for six months and things have gone pretty well. We live super close to each other so we see each other almost every day.

Anyway, to make a long story short:

Her and her roommate, Rebecca, recently purchased eight tickets to a concert next Friday. Emily, Emily sister, Rebecca, Rebecca's boyfriend and a few other people are going to the show.

I was never invited, which really wasn't that big of a deal. While I would have gone to the concert if I was invited, I find it strange I wasn't invited. I have been dating Emily for six months. We do a lot of things together. Rebecca is bringing her boyfriend. Why can't Emily bring me? Why didn't she even ask me to go?

Emily's cousin was supposed to come, but because of work she can't come. So there is an open ticket. I was over Rebecca and Emily's house one day when they were discussing it. Still, Emily never invited me.

Instead she invited one of her guy friends, Paul, to the concert. I would be OK with this if Paul and my girlfriend were best friends, but they have hung out like 2-3 times and just know each other because they are in the same program at school. Additionally, out of all the people in her program my girlfriend knows that I think Paul is a little sketchy. Sometimes he will ask Emily if he can come over. She claims its because he has no friends and is new to the area. Who knows. One time he came over at 10pm on a Saturday...to "grab a book." I was there when he came over, but I mentioned to Emily when he left that it was really weird he came over that late on a weekend to see get this book. She thinks nothing of it.

Emily and Rebecca are also in the same college program, which only had about 50 people...so naturally everyone knows each other. For some reason out of all the guys I have met in the program (about 15 guys, 35 girls...everyone frequently parties together) Paul is the only guy I have a weird feeling about. I'm positive Emily knows this.

I didn't want to give my girlfriend hell for this and while I do want to trust her this rubs me the wrong way. I am usually not a jealous guy, but she basically said she didn't invite me because I don't invite her to everything I do (I don't know what she is talking about) and that we don't have to do everything together. As I stated before we do live super close. We live within walking distance of each others places and see each other almost every day if possible.

Am I overreacting here?

Or is this situation a little shady?

Thanks for the help!
My girlfriend invites her guy friend to the concert, but not me?
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