Hey bjm-
To Mutt's point, it was pretty unprofessional for your therapist to tell you about whatever happens on his FB page, even if it relates to you in some way; that's his personal information and sharing it could be considered a breach of professional ethics. In any case it's got you thinking stuff that isn't helping, so maybe he's not doing his job well.
Anyway, you mention you walked away because not only was
the relationship lie a tornado
, but you suspect she's a drug addict and that's unacceptable to you. So the fact the relationship is over is a good thing and what you wanted, yes? And it's natural to feel like even though we don't want a relationship with someone and leave them, we still want them to want it, because it means we mattered and are still attractive to them. Her reasons for not trying to contact you don't matter, what matters is you and what you're focusing on; this is a great time to dig deep and look at your part in the relationship, why you got in it, how you felt when you did, what you did and how you felt when upsets showed up, what you made it all mean, how you felt towards the end and why, and how you feel now and why. And only from a place of taking the information to gain insight into yourself, and then slowly but surely shift the focus from the past to the future with the new information, so you come out the other side an improved version of you. Live, love and learn.