I think he made the initial choice out of some lingering feelings of guilt about leaving the relationship. Once you began talking about it and he has seen that it was a mistake he has rectified it. sometimes endings aren't clean and they can linger, but that does not mean he doesn't feel strongly for you. It sounds to me like he wants to build something with you, so I believe trusting him, trusting what you are building and letting all of this go is the right way to go here.
So great that you see where those feelings are coming from and how his recent behavior has brought it all up. In a quiet, loving moment between the two of you, I would remind him of your past pain and how this has brought it up and how you desire for a different experience here with him. Just hearing that could help him to be more mindful of how his actions affect you.
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