My [28F] boyfriend [32M] has gotten better at sex but I’m not happy about why… should I talk to him about it?

My boyfriend and I have been together for 3 years. Generally everything is great except for one issue which I suspect I'm not alone in…when it comes to sex foreplay is definitely lacking. It's not nonexistent, but oral on me is generally not part of it. He doesn't demand oral in return or anything, so I've mostly let it go, but it does bother me a little. I figured nobody is perfect, it's not a dealbreaker for me, so like I said I didn't really bring it up as an area of concern.
Anyway lately that has changed…a lot. He's started going down on me not only every time we have sex (and for long periods of time- on a good day it's about 20 seconds) but randomly when I least expect it. The other day he did it when I came home from work and I was definitely not in the state I'd prefer to be in to receive oral (It had been a good 18 hours since my last shower.) I asked him what's going on and he said he just realized he likes doing it. Now obviously I was a bit suspicious because what are the odds that at 32 he suddenly starts liking something he's never liked with zero outside influence….honestly at this point I thought he might be cheating on me.
But then I made the mistake of using his computer to find this video I made of our recent vacation (I used his computer for it because he has video editing software that I don't have on mine.) And his iMessages are attached to his computer. I started seeing messages from his friends coming in about "How's the pussy eating resilience going?" and I'm like…what "resilience"? Anyway, curiosity got the better of me and I scrolled up on their conversation and apparently they are all devoted fans of the Huberman Lab podcast (Not sure if everyone here knows about it but I've known he was a fan for a while, I listen to it sometimes too) and there is an episode about "building resilience" and one of the main takeaways is that you need to do something you don't enjoy for increasingly long periods of time, like cold plunges or strenuous workouts etc in order to build resilience. So he's going down on me a lot specifically because he DOESN'T like it and he thinks it's enough of a hardship to "build resilience."
I'm really hurt and embarrassed, but at the same time, he didn't really do anything "wrong" like he didn't cheat on me and he hasn't told me any of this so I can't accuse him of making me feel bad. But it's really taken the pleasure out of it because now all I can think about is how much he hates doing this and how the entire time he's imagining Dr. Huberman and "hardship" or whatever. Anyway, I'm stuck on whether I should bring this up to him. It obviously looks bad that I "snooped" idk. I'm just extremely embarrassed and not sure what to do. Should I talk to him about it or let it go?