monogamy

Erin • NH/ live free or die
I was in a relationship for 3 years and had my heart dragged though the dirt along with my self esteem. Obviously I'm not over it or I wouldn't be posting. 
  I've come to the conclusion that true love does not exists because men are incapable of staying true to one person. They can love you and care about your well being but they will never only look at you and only want to be with you. I have this theory that all men cheat. My ex said to me " Men just want to spread their seed to as many good looking women as possible, it's genetics."  Thoughts?