Women dump men for different reasons. There really isn't one reason why women dump men, there are manny issues that affect a women's with her man.
Some of this factor may be his personality. Other factors may have to do with how she makes himm feel about herself. Men fall in love with a woman that makes him feel good about who he is and women do the same thing.
Why do women dump men?
If there were just only one answer to that question all our problems would be solved, some women dump men because he wasn't exciting. Some women dump men because he didn't rule the relationship the way she thought a real man would.