I'm going to steal my college roommate's girlfriend.
Are you serious? Why would you steal your roommate's girlfriend?
It's just instinct.
You shouldn't intentionally try to steal someone else's partner. Your roommate would be crushed if his girlfriend broke up with him, and it would be extra painful if he knew it was because of you. You should respect their relationship and leave them alone.
This is just a game, I'll apologize to my roommate.
Even if you apologize to him, you ought to respect your roommate enough not to take his girlfriend.