I had a guy in my D&D gaming group with a smokin' redheaded girlfriend. All of us thought the red head was gorgeous but, you know, guy code... until it was revealed that the slightly-annoying-but-tolerated powergamer of the group made it clear that he thought he was "next in line" to date the redhead if Guy #1 left the picture. Utterly destroyed our gaming group. It all came out at a party, in a chat about relationships. She just simply laughed at him and said she'd never get together with him regardless of how things turned out with her and the SO. His reaction was simply to swallow his pride for the rest of the night but the consequence was immediate. We never gamed with him again after the party. Redhead thought it was hilarious in a /r/sadcringe kind of way and hurt his feelings, and I personally (as the Dungeon Master) was aghast that a human being's mind could operate that way. Like, dude, she's not a friggin' carnival prize! I couldn't stand to play or even speak to him anymore, but it was pretty clear he wasn't coming back anyway. Good riddance!