My (27F) BF (M29) said he wants to see others, changed his mind after post nut clarity

TL:DR: BF said he wants to pause relationship to go shopping for experiences. Had a wank and changed his mind (mostly).

BF of almost 3 years & I were looking at porn – he shared his saved folder which turned into him sharing his fantasies more broadly. He said he's very interested in having dominating kink experience with a near stranger (something we can't do presumably).

We're both kinksters and I'm pretty sex positive, but I'm not as caught up on kink as he is. Told him I could be open to discussing this down the road, but am more interested in shared kink experiences with other people as partners for now.

Dick still in hand he said no, it's not exactly like that and that he kind of misses dating/meeting new people. He told me he fondly remembers a kink fwb from before we started dating and he wanted to experience more of that before "settling down" and got real nude when talking about this.

I'm his first long-term relationship – he said he treasures what we have but may want to put things on hold to see what else is out there. He added that when he'd originally told he loved me it was because he felt like that's what people "should" be saying and he's not sure if it's "it" due to limited dating experience. He's not sure if others are worse or better than me, fair I guess.

I told him "understandable", probably up to him to decide and that frankly, I'd prefer he figures his shit out because I deserve a partner that wants to be with me. This was a 2hr discussion with no orgasm, so we called it after I gave him my 2c. He went to shower, and came back saying he'd just had a quick wank and perhaps "all that" was kind of just a horny fantasy, mostly. He cuddled up to me and was extra affectionate this morning.

I get where he's coming from, grateful he was able to open up and am happy to talk it out but geez that's one hell of a 180° nut. This brings up some old wounds & I'm having some difficulty returning affection right now. Any of y'all ever have FOMO like this? How did you address it?