I feel so dumb...

just know that as a friend (people in general.. not attacking anyone in particular), one should know that you NEVER date your friend's ex. a lot of drama!! and if he used you, then screw it. guys are not worth all the trouble. just go on and take it easy.. and you'll be okay. just learn from this and try not to let people walk all over you. good luck with everything. like erika said, stay strong!

If the shoe fits....wear it.

He used you and i think that should be enough to get rid of him as for your friend just watch out for her losing a friend over a guy is not worth it. I know ive been in that position i hope things work out and not for the worse either. good luck