Freshly cracked pepper is ruining my relationship

I don't think he's on here but throwaway to be safe. Since all this started, my boyfriend (28M) and I (27F) have been quarantining together. This works well for me, as he's (normally) a pretty great cook. I'm capable of feeding myself as well, but he's better at it and seems to enjoy it more so he does the cooking and I do the cleaning.

The problem is that he's obsessed with black pepper. I like pepper as much as the next person; there's a reason they put it on every restaurant table. I don't even mind when his food tends to be very heavy on black pepper, as it has been lately. I could handle it up to the point where he started putting it in baked goods (sweet ones).

It started with a cheesecake that had so much black pepper in it that it looked like a granite countertop. Then it was cookies. Then lemon bars. It all tastes as bad as you're imagining (until recently I've been a good sport and tried all his pepper creations). I've tried being gentle, but I refused to try his latest creation (blondies) and how he's upset.

When I point out that virtually no recipes call for black pepper, he says that lots of them don't call for salt but that I have to admit that adding a pinch to sweet foods enhances the flavor. When I try to explain that salt and pepper are dramatically different things, chemically speaking, he deflects by going on tirades about pepper's role in the spice trade and that it deserves to be used as much or more than salt. He's started ordering different kinds of exotic peppercorns from around the world, and a new pepper mill to go with each one.

He shut down when I refused to try the blondies a couple of days ago. The only time he really speaks to me is around meal times, and then it's just to say something like "I'm not going to bother cooking for you since you'll just say it has too much freshly cracked pepper, so figure it out yourself." This isn't true, his savory cooking is fine, it's just the baked goods that are bad.

(Another, smaller but still annoying thing: He won't just say "pepper." When he talks about it, he says the full phrase "freshly cracked pepper" every time. It's really irritating)

I don't know what to do and I feel like I'm going crazy (or maybe he is)? He's a perfectly normal guy in all other respects, but I can't keep on with a situation where my only options are to fend for myself or eat terrible tasting baked goods.

TL;DR My boyfriend is so obsessed with freshly cracked pepper that he puts is in baked goods and gets mad that I don't like them.

Edit: Thanks for the support, I know I'm in the right here but it's nice to hear someone else say it. We're finally talking about it. I was dreading it but it's almost dinner time so I said I guess we should figure out something to order. To my surprise, he said he was thinking about making breakfast sandwiches for dinner, but figured I wouldn't let him put any freshly cracked pepper in the eggs. I didn't appreciate the snark but it was an opening.

I reassured him that I greatly appreciate his cooking but just didn't understand the pepper in the sweet baked goods. He admitted that quarantine was getting to him and he wanted to figure out how to do something that hadn't been done. I told I understood but some things just aren't meant to be. He said I might be right but he wants to keep trying. I agreed to be open to trying some things if he genuinely thinks he's onto something in exchange for him continuing to cook most of our normal meals and halving (or more) the recipes on his baked goods (to avoid waste). It's still bizarre but I think the disagreement was more quarantine frustration than anything.