Move on and be a better person?

How can I move on and be a better person?

My ex of two years broke up with me about a month and a half ago and we’ve been texting back and forth and he always goes between wanting me back and not even though he has a girlfriend. Last time (last week) he did it he blocked me after three days of asking for me back and I freaked out on him and spammed his phone with calls (yeah it’s super creepy now that I think about it and I should’ve just let it go) anyways he said he’s over me and that I should move on and it broke me but I guess it’s what I needed to hear.

It’s hard but I want to make myself a better person so he can see what he missed out on and so I can go back to being my confident self that I was before we broke up. I just don’t know where to start