I ditto what peaches wrote - seems an easy way out to me!

I agree with Michah also, i've held resentments for a long, long time only to realise much later on that the only person i was hurting was myself.

For me (***warning - what do i know about friendships/relationships!!***) - Once you know what a person is like, it doesn't stop you being friends with them but it allows you to put in personal boundries of how emotionally involved you get with them to avoid getting hurt again. I think that is a healthy way of interacting, i think!