I had an online ex when i was 13. He was 33 but pretended to be a teenage boy. He confessed to me that he was actually in his 30s and that he still missed his ex who was in his 20s (22-23?) and that it was wrong for him to talk to me at my age (true).
He eventually showed his real face, which i forgot about, on his instagram (which has either been deleted by him or i forgot the username anyway). He then told me it was my fault because i guilt-tripped him into dating me and also “groomed” him, even though i didn’t make him feel bad at all. I liked him and he showed an interest, i thought he was like 14.
If he blames you for his grooming of you, he’s not sorry. He might feel guilty (or might not), but if he’s refusing to accept blame, it doesn’t matter; He doesn’t feel sorry and doesn’t want to change his behavior.
Some people are just evil people who will have no issue with hurting others, and based on what you’re describing, it sounds like he’s part of that group.