What is love to boys and even men?

Why are so many boys and men hurting girls and women feelings when it comes to love? They play around with their feelings, and then hurt them. This really hurts, and I am speaking in knowledge of this. They held you on and then shoot you down when feelings are so high that you think you love them. Or for some they will drop you and pick you up again like they can treat you anyway they want to. Say things that sound great at the time to come and find it was a lie, and they were playing games because they never really cared. But my question is why? Why mess around with your emotions and lead to the water, but leave you to drown when they never wanted be with you anyway? What's the out come on their side from that when karma comes back two times harder than what was done? I think if they know that they don't want nothing but what you have than they shouldn't even stop and come your way. It's trouble at your door step, but at the time it seems like a friendship, care, and than love, and that's nothing they want. Why are boys standers they set for their self so low? As in how they want others to view them and how they treat people who love them? This isn't fair that boys and men do this to Beautiful ladies that will do so much for them.