It's great to hear that you found your way out of your past... but it's easy to fall into the trap of wanting to make sure no one else gets used the way you did, especially someone you care about.
We all see things differently, because of our pasts.
Your partner needs to find their own way in life, and decide for themselves what their boundaries are. Their interactions with the outside world are just that... Theirs.
It's never a bad thing to help someone 'grow' in life and assert themselves a bit more, but it can't be your focus in life, to the point where it causes you to be depressed.
You can only control your reactions and how you life your life. The rest is none of your business, and he's allowed to "learn" from his actions. Just as you are. It's not really wrong. It was a different path. And it cannot be changed.
So look to the future, and focus on what you want to do with that. Write a new page. find out what makes you happy. That's what is important.