I think it depends a bit on the kinds of changes he was asking you to make, and what your progress was (because if he couldn't notice any change, was it really significant?) But in general, when one person in a relationship asks the other to make changes and that partner really struggles or finds it impossible to make those changes, it's usually a sign of deeper incompatibility. It's unfair to both partners because as you said, one isn't getting their needs met (assuming the changes asked for are reasonable) and the other person is being asked to change in ways that are likely fundamentally at odds with who they are as a person. It's really a no-win situation. You're absolutely right that we can only change when we want to for ourselves, we can't expect that to happen for a partner. And that means change is going to happen at your own pace, and maybe not how/when your partner wants it to happen. I think it's too soon and fresh after the breakup to really be thinking about getting back together, I think you may be having regrets which is normal. Leave it alone and after it's really been a significant amount of time (like years) and you think you've had that personal growth and you still want to revisit the relationship, you can.