Dump Herrrrrrr.

Harsh. As for the dude being gay, I'm sure if the OP and his GF were together for a period of time he'd have met her friends (including the gay friend). Otherwise I'd talk to her, find out who he is and then probably dump her. I would never be naked around my girl friends since I have a girlfriend and that would be disrespectful. I guess the best course of action would be to figure out who Kevin is (gay or not). If he isn't then find a cute girl friend and then find a situation where you could be naked and hopefully when your girlfriend texts you you can use the same line against her. That's the best way to mindfuck someone. Use the same situation against them so they can walk in your shoes for a while. That way if she dumps your or gets mad at you then you have an excuse to tell her what you really think of the situation she was in. And if she was "joking" about a guy being over there that's just wrong in general and definitely not something you'd do to someone you supposedly love.