I have to say "Nancy K". (last name kept private to protect me) A girl I went out with once. The next time I saw her was a happy hour joint. I was visiting with another girl I had dated a few times and really wanted to pursue.
Nancy K, comes over, pushes the other girl from behind and says, "why are you talking to my boyfriend. We are going to be getting married next year".
Needless to say, the girl I wanted to pursue never spoke to me again.
And due to desparate times, I dated Nancy K through that summer before I got tired of sleeping with one eye open.