Hi. I think this is really one of those things that you have to negotiate as you go along. Ultimately, YOU are responsible for what goes in your mouth, and HE is responsible for what goes in his. I'm on my third serious relationship since going LC almost 16 years ago now. I made it work. My ex of 9 years was a non-LCing vegetarian, but we were both happy with our food. If the fact that you refrain from certain foods makes him look down on you, that would be bad news.
The reason it worked for me with the ex, and it currently works with my DH, is that when I went LC, I made the decision to take over the kitchen and make cooking my hobby. Do you see yourself as the cook in a serious relationship? Does that idea unnerve you because of the sexism? There's no right or wrong answer. If you're going to share in the cooking, he has to take your dietary needs seriously. He doesn't have to adopt them himself, he just has to respect them.
I think the only conditions under which I could NOT make it work in a relationship is if he criticized me, and/or tried to force me to eat exactly like he did. Only you can figure out your comfort level with that. I don't pressure my husband to change his eating. If he ever wants to change it, it has to be his decision. I know what healthier foods he likes, and I throw them on his plate, and we joke about it. Just the other day, he said, "Green beans?!! What the f*** is this?!!" But he eats it, and we laugh. And I eat my food. And that's it.
Hope that helps a bit...
(ETA) I consider myself a foodie.
It doesn't mean you can't tell yourself "no" to the things that are going to make you feel like crap and/or kill you.