Sex, Men - And Cheating!

I was recently dumped by my boyfriend of two years – who reconnected with one of his exes and cheated on me. He fell back in love with a girl who is seemingly less attractive, less of a logical choice, and somebody who had already broken his heart. Is it possible that men who feel inadequate/unworthy in a relationship will downgrade/sabotage relationships to feel more adequate/powerful with weaker/dependent women? Stefan Molyneux