I am currently looking for yaoi mangas that had the scenario when one of the main character (seme or uke, any of them) leaves the other for a period of time then it can be either they came back together or they didn't.

Please recommend this potato some! 😁

I'm sure there are many more out there, but here are a few that first come to mind.

Overdose by Kawai Touko
"Dessin" (Chapter 2) by Sadahiro Mika
"Warui Yume" by Tateno Makoto