yeah
don't you hear of those hmong guy killing their ex wife?
Husband killing his own wife because of infidelity is entirely different scenario to average boyfriend beating the crap out the other guy who has rich resources to offer the girlfriend.
Hence marriage is law, there are consequences or karma. The wife could've stay single if she didn't want to marry to her previous lover.
Outside of marriage as guys dating girls. It's normal for guys or girls reject anyone who's not their ideal type. There's no harm and both gender gotta move on.