This guy is a total . He doesn't care about her, niether does he defend her and basically treats her like . Yet she loves him (I don't know why). He's just in it for the physical thing. And he gives me a sly pimp-ish smile after dropping her off. How do I make my friend realise that he is atotal jerk. I don't want her to screw up her life.

You don't!

You let her find out for herself and you just be her friend.

She chooses to date him,its her life and her choice.

You don't want to be the one to break them up or have any part at all. If you take part she may resent you forever. She has to figure out for herself that he's a jerk.

If you want to remain as her friend, you'd be best to stay out of it entirely and just be there to help her pick up the pieces when it all falls apart.

Mind your own business, and let her make her own choices. You can tell her you don't like him, but its her choice to get used by him.