Boyfriend says he'll never be 100% vegan

TL/DR - both in late 30s, he's the love of my life and treats me so well, eats mostly vegan with me, but desensitised to animal cruelty due to upbringing and being raised by his father (a champion bodybuilder/meat enthusiast). Don't want to break up but want to feel better about his efforts.

We've been together a year and a half (started as friends) and he's the sweetest, most loving partner I've ever had. He watched a few docs with me (Dominion, Gamechangers, What the health) and has now become about '85% vegan', but mainly for health reasons, and to support my lifestyle. I transitioned about 4.5 years ago after watching the same docs, mainly for moral and ethical reasons, but he says he just doesn't feel the same way. His father is a champion bodybuilder and he was raised in a very meat driven household, taken to butchers and has witnessed animals being killed, so he says he's somewhat 'desensitised' to that element. I became vegan for moral/ethical reasons and I said I'd never date a non-vegan if they didnt share the same values, but he ticks every other box of everything I've wanted in a partner and quite happily eats vegan with me every day. I really appreciate the efforts he has gone to so far and I know that alone is making a difference, but for example, we are going to an expensive wedding in a few months and he has opted not to have the vegan meal - I'm already dreading watching him eat meat.

Is anyone else in a similar situation? As strongly as I feel about my veganism, I don't want to potentially lose the love of my life. We are both in our late 30s, if that helps!

EDIT : Thank you for such an overwhelming response to this post - particularly those that read the whole post - I feel there is a good balance of perspectives that is helping me make an informed decision on my particular situation, and I hope it will help others in a similar position. I especially appreciate the compassionate comments for both my partner and I. I've had quite a traumatic history in relationships, and other than this one thing, he makes me so happy. I naively thought he would turn 100% vegan one day, but we recently had a heart to heart and this is why I have made this post after being with him a while. Also we are attending a wedding together as guests, no marriage on the horizon for us yet, but ultimately I still would like to find a way to move forward in acceptance of him and his efforts to be better. We are also never having children, so that's not an issue.

I am also well aware that you can't be a "%" vegan, so please excuse the mistake - of course it would be more accurate to say he is 85% plant-based.