Eh. Not really. Any I mention here will amount to basically, “barely explored at all”:
Gambit and Rogue have both had moments on-going from Excalibur to X-Men, even while apart from each other. I don’t think it was that intentional, since they are mostly short moments and not drawn out arcs, but because writers like using them so much, they are inadvertently given more characterization than most in this era, which says a lot more about the romance of this era than it does about Gambit and Rogue.
X-23 and Synch is new, so Duggan has been diving into that, ever since Hickman introduced it.
Percy has been carrying the dynamic of Jean and Logan on his back the entire time where no one else is even looking at the throuple for anything. Hickman focused on the family aspect, I.e. Scott and the kids. Duggan has been focusing on individual character moments. (Not arcs, but moments)
Same goes for Quentin and Phoebe. Percy is carrying that dynamic moreso for the same reason he is carrying Jean and Logan. For the character development of the male love interest, Aka Quentin and Wolverine. Since they are the main characters of the team, I can’t fault him too much, but you can’t really say much about the couples if we mostly are getting the male perspective. It’s very telling that we barely get Jean’s feelings regarding Logan from X Lives of Wolverine after so many years of Percy handling those two characters. We still don’t have a full picture of Phoebe’s perspective now.
Kid Cable and Esme are my favorite new pairing, but it was short-lived. I don’t know. They are two kids having fun, while growing up way too quickly for their own good. So, as far as being explored, it’s bare bones, yet because it’s young love, it kind of gets a pass for showing teens just having fun, which is how I personally think of teen romance dynamics.
Daken’s dynamic with Aurora and Somnus has oddly enough been the most intentionally done romance for both love interest. Leah completely changed Daken’s personality to do it, but it still counts, I suppose. Somnus was done in a short span of time, but you kind of get the point in the comic it’s introduced in and are seeing how that factors in his actions and treatment to Daken. So, as far as fully exploring couples, Daken and those two are probably the best, which still does not really compare to past writers writing of characters, but if we are comparing to the entire era now, it’s the best from my standpoint.