Very close once in college. Dating two blonds for a while (very casual they both knew about the other)(one was sort of the ex and the other the new). Eventually got serious with the newer gf. Then on my birthday the ex shows up at my place unannounced as I am preparing for a date with my GF. She knew I was serious now about the other but apparently didn't care. Then my GF showed up. They faced off and talked very pleasantly but tons of tension. Lots of hidden verbal jabs and barbs. You can imagine me... lifetime dream about to come true. But then I worried the GF might get hurt or worse might loose to the ex gf. So I snatched the gf's arm and practically dragged her off saying something about being late for our date. She was furious. Funny thing was, when I came clean with her about my interest in this stuff years later (I married her) she accused me of setting up the whole situation. But I stopped it and about a dozen other near misses with her. Didn't mean anything to her. It couldn't have possibly been her temper, must have been my fault. No arguing with that logic, eh?
