maybe you could try doing what i've just started doing recently with negative IRL friends...just stop answering their phone calls and don't answer the door to them. they can't hurt you if you don't let them in.

i know it's easier said than done and takes courage coz just the thought is scary, but i felt much better after i achieved it the first time.

good luck to you however you decide to deal with it and don't forget we're always here for you.