H.W.
If I was ending a business relationship with a client who told me that they'd had misgivings since nearly the beginning of the time we'd started together, I would wonder what was wrong with them that they didn't bother to speak up, come to me far, far earlier and be solution-oriented by asking me or telling me what they needed. I likely wouldn't want to continue the conversation, because at that point, it's going to be a 'blame me' festival, which I am not interested in participating in.
Fully formed adults are able to speak to each other as problems arise, not retroactively. That's like breaking up with a guy and saying "I knew a year ago that we shouldn't be together"... but still staying in the relationship.
You are still angry about a job which ended a long, long time ago. I know you have a lot of anger because you have sent other people some pretty nasty PMs and called then profane names because you didn't like their response to you. The exhortations for you to take some responsibility, move on with your life and 'grow up' are worth heeding. I find the mention of gaslighting rather ironic as you keep re-presenting information in the hopes of duping us into agreeing with you. (If anyone reading this is offended, I encourage you to read this poster's history of questions before going off and reporting comments.) No one is interested, professionally or otherwise, in rehashing old news. So if a client were to start this sort of interaction with me, I'd likely say "I'm sorry you felt that way, it would have been helpful if you had brought it up sooner" , they would lose my respect and then I would move on. A grievance with no effort behind it to find a solution becomes of little consequence after the fact.