@LittleMo234 - reading between the lines, you ended things after 5 years because you felt your relationship wasn't going anywhere. That seems like a very sensible thing to do. Maybe I'm way off beam but perhaps that's why you were able to friendzone him rather than going completely NC - perhaps because your relationship felt more like a friendship than a committed long-term relationship anyway.
People do make mistakes and it sounds like you reached out to him pretty quickly to say you had made a mistake in ending the relationship. I think you're right - the fact that he hasn't taken you up on the offer to get back together suggests that he may have been happy for the relationship to end.
Your story is ringing some bells. I don't know if you have posted before. There was another thread with a young woman who'd been with her boyfriend for a similar length of time but there hadn't been any physical intimacy for ages and it felt rather as if they were drifting into friendship rather than being lovers and the boyfriend seemed unbothered by this but the poster wasn't. She finished the relationship (with MN encouragement, including from me because that really did sound like the best thing). She then noticed that her boyfriend seemed very keen for them to stay apart even when she floated the possibility of a reconciliation.
In all honesty - it doesn't really sound like finishing the relationship was a mistake. Yes, he may not want to risk being hurt by you again but I can't help thinking that if the feelings were strong enough on both sides and the relationship good enough, he would have been willing to give you a second chance. After all, you'd been together for 5 years.
I know of two couples where one partner (the woman in one case and the man in the other) finished the relationship after a few years together, realised they'd made a huge mistake, asked to come back and the relationships resumed very successfully. (In both cases, the couples in question have now been married for over 20 years).
So the fact that he's not interested in exploring the possibility of a reconciliation suggests to me that he's happy with things as they now are, which in turn means that ending it was probably the right thing to do. As a PP suggested - you may need to go NC to get over him.