I'm a vegetarian. I generally end up dating non-vegetarians. Like you, I don't complain or make going to a steak house for someone else's birthday a big deal. I've got the more restricted diet, I'll fend for myself on those occasions. I try to be gracious if someone asks: "let's go wherever you want, it's your day! I'll be just fine." And I've had the pain of only side dishes many times. Oh well.

However, this guy is a jerk. Every guy I've dated has never wanted to become vegetarian (which is fine) but they're willing to share vegetarian meals so long as they don't think it's got "weird" ingredients like tofu. That's acceptable too. But there are so many normal vegetarian dishes, eggplant Parmesan for example. Macaroni and cheese. Dishes that are delicious and don't happen to have meat.

I'm not comfortable cooking meat, but I always offer that he can bring meat to add and prepare it if he likes to add to his dish. I think that's a fair compromise. And generally the guy says "nah that's ok, I'm good with what you're making." Because the guy likes me. Because he'll eat vegetarian for one meal without throwing a shit fit over it like a spoiled brat.

Also, the big difference here is you do not eat meat. He does eat vegetables. So if he cooked meat you're exempted from being able to eat it. If you make veggies, he can still eat those things. So he's just being a jerk.

I feel it's like you're dealing with a kid. A kid who only wants Kraft macaroni and cheese. And won't eat anything else or the kid throws a fit. Except this guy demands meat instead of Mac and cheese and throws fits over it. So basically, he's acting like a child. Should he have to go vegetarian to date you? No. But you're not asking that. Should you have to eat meat to date him? Absolutely not. There should be compromise. It doesn't kill someone to have one vegetarian meal now and again.

He's not willing to accommodate you, and you've been willing to accommodate him, so it's time to kick him to the curb. Unless you want to keep dating someone who is emotionally acting like a spoiled stubborn toddler.