I don't know. I mean it's fb. It's not like you picked up the phone and gave her an earful. It's not as though you stormed up to her ranting and raving and attempting to belittle her.

Maybe she rubs you the wrong way more so than having the successes that you feel bitter about not having?

You feel the way that you feel and that's fine. Feelings are feelings.

Maybe block her for good measure, which might alleviate some of the "guilt"? Is it only guilt or fear of discovery of the "unfriending"?