This kind of stuff happens all day long on stupid fb. It’s understandable that you did it. It’s ok to stop beating yourself up for it and move on. It’s good that you are dealing with your issues for yourself with a therapist.
FYI- I just blocked my bff on all social media and have to permanently be rid of her. She won’t stop text bombing me and going off on me in rants. I can’t have this toxicity in my life anymore.
This friend of yours was not a real friend. You had only just reconnected. The friend I defriended was a life long toxic friend.