I know how you feel man, when my gf joined a volleyball team with her friend and she would come back all like oh those guys are soo good n shit like that wich would get me worried. Or the time she went to her ex boyfriends party and some guy tried to pick her up.
I used to be really worried when shit like that would go down, but turns out she often talks about me when people ask if shes got a boyfriend or whenever at work n shit. I trust her completly now and im not worried at all.