Most Helpful Guy
My thoughts on it all is that he wanted to go further and did care for you and such. The harsh things he said were in the heat of the moment and anger fueled, so while they may have been spoken from his heart to an extent, it wasn't like he didn't care about you.
I'm guessing he still has a bit of residual feelings left over from the relationship, but not much. They aren't very romantic and he has basically moved on since the "bridge was burned," so to speak. This text was a way of remedying things, clearing his conscience, and creating closure. It sounds a bit like a goodbye.
It's all speculation, but I'm guessing it was the latter-- "something he wanted to say before moving on."
Most Helpful Girl
I think that's really nice he reached out and apologized. Sometimes our emotions can get in the way and we can say things we don't mean, because we're hurt. He was probably feeling rejected at the time and possibly (like you said used) so he lashed out.
A man that apologizes is pretty fantastic! It shows he's thought of his audio a towards you and cares enough that he decided to write you and express that.
It's hard to say what his motive was, whether he missed you or if he was feeling guilty and just wanted to clear the air. Either way he wrote - you responded and it was all done in a mature way, so that's a bonus :)