are separated in the end but are implied to be together again later on? Kind of like an, "Until we meet again," scenario.

Sorry, I've been so obsessed with Goshintou which features a pairing like that in the first volume that I've been trying to find stuff similar to it.

Thanks. ^^

for now, i can only recall:
Sigh's Kiss: http://www.mangaupdates.com/series.html?id=1252
Jazz: http://www.mangaupdates.com/series.html?id=4305
Passion: http://www.mangaupdates.com/series.html?id=2543
(note: For "Passion", I don't recall if they separated after the main character graduated)
Lover's Doll: http://www.mangaupdates.com/series.html?id=41972
Stay the way you were: http://www.mangaupdates.com/series.html?id=15188
Demian Syndrome: http://www.mangaupdates.com/series.html?id=1307

i clicked on Goshintou and tried clicked on the category link
http://www.mangaupdates.com/series.html?category=Awaiting+Return+of+Lover+%2F+Spouse&genre=yaoi

the other could be a time-skip:
http://www.mangaupdates.com/series.html?category=Time+Skip&genre=yaoi

hope it's somewhat helpful

i tried reunion & yaoi category:
http://www.mangaupdates.com/series.html?page=1&category=Reunion%2Fs&genre=yaoi

Thank you! This will definitely be of help. ^^