Forgotten Title BL Manga - Borderline Cheating

Ok so I’m looking for a manga that had borderline cheating. I don’t really remember how the plot started cuz it’s been a while but I know some key details.
-high school setting
-the couple(?) was open and the whole class was like super supportive to the point where everyone gathers to talk about them (positively) I think
-shit(?) happens and the seme goes out with a girl just to try it I think
-the girl seme goes out with likes the seme and wants to get between him and uke
-in the end they’re still together because seme likes uke
plz help meeeeee

 

Wait what. So youre saying they were dating but the seme wanted to try what being straight was like?

 

Two-timing is no bueno. Hope he gets his just desserts but prob won’t happen since he’s ML

 

No it’s like the seme was undecided I guess??? Like the uke was all clinging to the seme but their relationship wasn’t “official” yet. So then the seme “dated” the girl to see what it was like and ofc yaoi logic the seme ends up with the uke. Tbh I wanna reread it just for the supporting classmates