Significant other's friends

[LucyKKG]

Have you ever had an intense loathing for one of your significant other's friends? Oooh I do! Here's the deal:

Dan has a friend from high school with whom he has recently reconnected. I've met him a few times. (I won't say his name juuuust in case.) I hate being around him because he barely acknowledges my presence! I realize I'm "the girlfriend" and the dudes want to catch up and chat. However, he won't even include me in a simple conversation. I try to interact, make relative comments, and ask questions. I haven't seen him since June, luckily.

Anyway, Dan told me today that his friend was going to be moving out of his parents' house finally. (We have recently graduated from college, so we're both at our respective parents' houses. I think his friend has been out for a year or two.) I guess the friend wants Dan to move with him, and he is interested but can't afford the rent right now.

So the topic is off the table for a while. I was thinking about it later today, though. What if this a-hole was my dearly beloved's roommate? Augh! My boyfriend knows how I feel about this guy. I won't say anything about the living situation right now because it's not an imminent threat. What should I say if it DOES become more of a possibility?