My ex is seeing therapists!

I was wondering what you thought about that because it's such a mystery to me, I don't know what to make of it. I know it's an obsessive thought and I should let go because at this point it's not my problem anymore but maybe it would help me stop wondering about it so much.
I hear and read everywhere that people with NPD (if that's what my ex is) rarely get into therapy.
My ex's mother is a shrink. He went into psychoanalysis therapy for almost 7 years as a young adult. When I asked him why and what he got out of it, he was very vague and just said "it felt good, I just needed to talk". He made it sound like it was the same thing as catching up with an old friend over a cup of coffee. For years, he didn't go back because he moved countries.
He was in a relationship for 3 years with a girl he lived with and cheated on for 6 months until he dumped her for the new girl he'd met at work. He had a major breakdown and went into therapy again. I didn't quite understand why he was so hung up on his ex and so depressed when he had met someone else and moved on. He was with the new girl for a year, then he met me (at work too) and dumped her for me. He triangulated her and I like you wouldn't believe and again went into therapy. The whole time, his therapist was apparently telling him that he was always getting himself into difficult situations (lying and manipulation) and was always choosing the wrong girl. His shrink told him that it didn't matter whether what my ex thought of me was right or wrong, but that he should walk away just because I was bad for him. He told me he was going into therapy to get away from me. I read in his emails to his ex GF that he was still having a hard time dealing with me at work. He called me a narcissist pervert. Yet, once, he acknowledged we were both unstable and stuck in an unhealthy relationship. He recognised he was abusive to me, that I was the victim and him the victimizer. He called me in tears, sobbing, saying he wasn't sadistic and didn't want to hurt me right after one of his countless breakups with me. In one of his crying fits, he said "all you want is to be loved..." in an apologetic manner.
Needless to say, a few days later, he would turn the whole thing around and accuse me of making him cry, making him unhappy....I don't know how many times I heard "I don't feel good with you!" It's true I wasn't Grade A supply because I was constantly calling him up on his BS. My head is spinning again just thinking about it. For the longest time, I thought I had borderline personality disorder and that I was manipulative... I thought I was clingy, needy and smothering. He went NC with me about a month ago, only this time I'm not begging him to acknowledge my existence. No way. But he's making me look like the deranged one, the crazy girl to stay way from. He told me I would "never change".
I don't know what to think of all this. Could it be that he knows what he does? He probably knows something about him is off but he can't deal with it. Also, the cause of him seeking professional help seems odd. Any ideas? Can anyone shed some light or share a story? Thanks.