So my girlfriend is moving out and her new room mate is a male co-worker of hers. The reason we aren't moving in together is because I'm still at university. So I understand rent is high and I don't feel threatened by this other guy but I'm not OK with this. I don't want to be overbearing or make it sound like I'm putting a leash on her its just this is kind of upsetting me. I trust her but what if this guy is going for the long game or something? Grrr what are your opinions??

It all comes down to trust. If you really trust her, what the other guys intentions are shouldn't matter. No matter what he tries, she won't succumb.

So, if you really do trust her, and aren't just saying that, then trust that she's smart enough to know what she's doing, and trust that she loves you and will remain faithful.

How long have you been with this young lady? How much university do you have left? Did she discuss this with you ahead of time? What's the distance between you? A lot more info please.

Are they sharing the same room and bed ?

And other info, how far apart are you, if living in the same town, why are you not living together if that is what both want, going to college is not a reason not to.

Assuming they are not sharing the same room and bed, it is called room mates and is done all the time