Why do men lead women on?

Okay I know it's a two why street and some girls do this to. I for one have never done this. I think it's really mean and can be very hurtful especially if the other party is interested because they thought it was mutual. Guys if your not interested in a girl or are in a serious relation maybe engaged or married. Why would you lead a girl on? Why would you act like your interested in her. And for a long period of time not someone you just met, and casually flirted with for a few days I'm talking Months or even years. What do you get out of it? Answer my poll and please elaborate. Thanking you in advance.
Ego boost
Vote A
Your not happy with your partner
Vote B
It's fun and you don't care how it comes across as long as your happy
Vote C
Vote D
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Why do men lead women on?
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