OMG it's like you're in my head, I have very similar experiences with W.

Did you also ever notice that there were times where it seemed he was behaving/acting nice, made you think this might work out after all and then later on realize he was just playing nice with self centered motives? I get these flashbacks once in a while and just get hurt all of a sudden when my day was going along great.

Resentment occurs when we aren't doing what we need to care for ourselves, though we expect others to do it for us.