This is the reason why most guys appears to be hardened when it comes to loving a woman. Most times when guys are younger, they put everything into a relationship and girls take them for granted and treat them anyhow until they eventually dump this guys. The guy grows up with the mentality that women are bad.
When he start growing older and getting so much attention from women, he find it difficult to go back to his initial young loving state because his mind is already fixed on what he thinks women are and the women label him a "BAD MAN" without thinking of what they've done to other guys when they were younger.
Its a viscious cycle of life and will continue to happen that way because no body seems to learn from the older people's experience.