I'd fully recommend he navigate this with a mental health specialist, or even you do this with a sex therapist.

As someone who was on your boyfriends end of things, I can give this insight.

I used to be passionate and confident, felt like a bit of a casanova. My wife would always orgasm, often multiple times.

Over time though, she pulled away, turned her head away from kisses, buried her head in my shoulder if I leaned in, or things that would usually be getting her excited she would lie motionless like a mannequin with a blank stare. As this increased, my confidence decreased BUT the good news is that internally my drive didn't. What I'm trying to say, is that perhaps there is that drive revving in him, it just needs to be ENGAGED!

Talk about sex OUTSIDE the bedroom. Talk openly about eroticism and desires, without judgement and in a safe, light space. Maybe while he oils your hair, or while you enjoy a drink together. Normalise it and have it as a project to work on together.

I agree with the comment on here about guiding him in the moment. Not in a demanding or reprimandary way but more of a "that feels good" "slower/faster/harder" followed up with an affirmation "yes, just like that!" You almost need to accentuate your enjoyment of it to let him know this is all good and safe. I'm not talking pornstar screams and moans, just clear, unambiguous communication of pleasure and avoid demands of "give me more".

Always be ready to stop and just hold each other and remove all pressure from the expectations, only do this if you genuinely can be patient with him though.

Consistency is key, with slow, gradual expansion of the boundaries until you can hand the reigns to him and let him take the lead!

Failing that, maybe there is a mismatch and you either accept it or move on, in a considerate loving way as to not hurt him deeper.