They’ve both had sex with you
Hi, did I mention that they’ve both been inside you? This warrants two mentions. Men are biologically predisposed to hate other men who’ve had sex with their partners. In caveman days, men had to be ultra protective of the women with whom they’d mated, because if somebody else got in there, there was no way of knowing who the father was in the event of a pregnancy. I’m telling you, it’s a major problem.