Im going to give some background to start off. I am going to the military in a couple of months, so I won't be much home. My gf has been invited to her co-worker's (male) birthday, and I dont know what to feel about this. He constantly snaps her random shit on snapchat, and I'm not comfortable about it to be honest. I don't tell her that, because I don't want to come of as insecure. Her co-worker is aware that she has a boyfriend, because she has told me on several occasions that she talks about shit I do and things we've done together to him (the co-worker). Her co-worker has told her to bring me to the party aswell, but i wont be around for it anyways, so i cant go. My gf don't usually have orbiters like this, and we've been together for 2 years now, so it is making me uneasy. Im 20, and my gf is 20. Her co-worker is 25 or something, and i feel like that's a smv boost for him, since he is older than me. Don't get me wrong, my smv is fine, i go to the gym regularly. My gf fawns and compliments me all the time on my physique. Still, I am still swallowing the pill, and i guess my blue-pill self is reacting to this, but I still can't shake the feeling that this is making me really uncomfortable.

Would you guys let your LTR go alone to their co-worker's birthday party alone?