Echoing the rest of the comments here: as soon as he knew you were 13, for him to continue dating you is fucked up.

Also for him to blame you for making him date you is absolutely bizarre and stupid. HE decides whom to date.

And now to answer your question: I can only assume he doesn’t feel sorry. I could believe he might feel guilty but that’s because he realizes how fucked up the whole thing is. I can’t say for sure, and I don’t think he really tries to reflect, otherwise he wouldn’t even have gone that far.