Why do some men always repay women that helped them to make it in life either financially or otherwise with evil?

In times past you have men that their wives saw them through school, holding down the home font with all sorts of menial jobs. Immediately they become rich or well off, they go for other women and some even chase away their wives and children to suffer in the streets.

In recent times, we have young girls sustaining their boyfriends and fiances financially out of their little only for these young men to dump them once things become rosy. (so many stories abound of the above 2 scenarios)

Is it that when a woman goes the extra mile for a man, it is seen as she is desperate and should be despised?

Is it recommended for a woman to help out her man (boyfriend or husband) financially when she doesn't know how the tables will turn tomorrow?

Your thoughts will be appreciated. Thanks

@ poster, it goes both ways. But such is life, as we see it, Dont fret much about it, Its no use hurting your mind or heart about it. Move on, learn and be wise. finito

It happens both ways. Men are already used to it but for women. No! They can't get over it. Life is unexplainable. People stick around danger and at times get more fun hanging out with abusers than with gentle and meek men/women.

In sexuality, overly good and loyal is a turn off. It turns into brother and sister's relationship. Haven't you been turn off by a nice humble toaster?

Its not a man thing, its a people thing, the Bible says the heart of man is desperately wicked. I have known women who leave thier husbands when the going gets tough and hook up with husbands friends, One woman i know whose husband was a top military official who was sentecned to death during Abatchas time for coup plotting, divorced him and married his friend only for him to be pardoned and released, I also know cases where a man will train a girl and put her through school and the girl will abandone him for someone richer and younger. People both men and women can be wicked opportunists

@ op
Some people are just evil in nature, the thought of doing good makes them cringe.