Help please i just need to ease my mind.

My boyfriend( I call him husband 😅😅) is afraid of me and it’s not anything I did it’s more of what he went through with his ex which I cannot divulge because that is something personal, anyway he’s afraid I’ll try to do the same and I’m trying to was his mind about it but I’m just at a lost I mean he brings it up as a barrier and I know it is one but I’m not getting frustrated or anything just starting to feel a little like I’m being compared to her. He’s an awesome dad and an amazing boyfriend/future husband but I just want to calm his fears. I’m willing to work and stuff but with all the work I’ve put in with ex’s I’m a little tired. I’m not going to break up or anything just need some advice. I’m sorry if I sound confusing it’s just really hard to explain.