Women in long term relationships — How do you accept the things you cannot change?

I (F) have been with my boyfriend for 5 years, we’re both in our early 30’s. We share the same career, financial, and family goals. We overall have an enjoyable, stable, and positive relationship.

I certainly know that I have flaws and he has been patient/compassionate/accepting of my imperfections. I, on the other hand, mentally struggle to practice the same acceptance for him.

A hurdle I have not been able to overcome is his picky eating — lives off DoorDash, no fruits or vegetables, no desire to eat or cook homemade meals, won’t touch any leftovers, and it’s difficult to find restaurants he’ll go to. I understand that his food habits have a lot to do with how he grew up. I don’t feel this makes him a bad person, as his character certainly supersedes his picky eating. But it continues to silently nag at me. I worry about his long term health on this path. I also miss the connection food provides and I have to try new food on my own.

We’ve talked about it and he’s expressed that he’s not interested in changing this aspect of himself. I don’t want to end the relationship over this. I want to get to a point where I can accept his choice and quit letting it bother me.

Besides the obvious therapy, does anyone have any similar experiences and/or tips in overcoming differences like this? Does something like this become more or less annoying as you get older?

EDIT - Our finances are separate but we contribute to shared expenses. He budgets and pays for his own takeout. No kids in the plans for our future together.

He is not a jerk about this, I didn’t mean to paint him that way. I don’t think he WISHES he were this way, but it is too much of an ingrained habit, probably a comfort/familiarity thing, and he hasn’t had any negative health consequences yet to warrant making any real change.

He is happy to split grocery costs with me, but I think it’s unfair to him cause he doesn’t eat any of it. He will go to family dinner and some restaurants that I choose, but will pick up fast food before or after if he doesn’t want what’s on the menu.