Girls who still pursue married men

I don't understand the logic why there are girls who pursue married men. It makes me sad at some point because I hope they value their worth. I used to say "bata pa sya, she could meet any other decent men, but why does she cling to someone who she knows is already married?" Have they even forgot that there will be people who'll get hurt, including themselves, because of their choice? Maybe you girlies have good ideas why they do this, I would love to hear your thoughts on this.