Mine is not on Facebook (he told me he's not on any social media--well, LinkedIn, but that doesn't count). However, his wife is on Facebook, and she posted in a parenting group I'm in (I was in the group before I started seeing him and had no idea she was in it). I emailed him to let him know (in retrospect, I should have just not said anything). She left the group later that day. I felt bad that she had to leave the group because of me, and T said she didn't post in there much anyway, so it's OK.

I have no idea if she blocked me from her profile because that would likely require my T to give her my name, which would be a breach of confidentiality (I haven't tried to look at her page after reading that, on certain apps or browsers, there's a way for people to see who looked at their page--not sure if that's accurate or not). But I imagine if I told him I was looking at her page, he'd have figured out a way to have me blocked. (I admit I did read her past posts in that group before she left, but T said he understood that, because it was a group I was already in, I wasn't looking at her private page.)

I know it's painful, but I can understand why they do it if they use Facebook for a personal page, rather than a business one (I know some have business accounts, and that's different). They may not want clients to see the potentially messy details of their personal lives. Or if they knew clients could see, they might feel they need to censor what they post (say, avoiding anything political or controversial in any way). Also, your former T may just have a policy of blocking all clients, not just you.