Boyfriend has past relationship trauma?

My boyfriend has a LOT of past relationship trauma. Manipulation, jealousy, not trusting him, etc. I keep telling him I’m not like that, I won’t get upset over that, you don’t have to worry about that, etc. He sees that I’m not like that and knows but the trauma is there and he can’t get past it. How do I show him that he doesn’t need to be afraid or nervous and that I’m not like that?

Boyfriend has past relationship trauma?
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