The first thing that came to my mind was this one https://www.mangago.me/read-manga/this_ending/ it's a short and rather depressing story that leaves you with a bittersweet feeling but it's also a really great and impactful read!
Ex bf reunion
http://www.mangago.me/read-manga/puchitto_hajiketa/
http://www.mangago.me/read-manga/escape_journey/
http://www.mangago.me/read-manga/till_our_lips_touch/
http://www.mangago.me/read-manga/inner_beauty/?xsrj
http://www.mangago.me/read-manga/dark_heaven/?zd9V
http://www.mangago.me/read-manga/warehouse/
http://www.mangago.me/read-manga/hello_morning_star/
http://www.mangago.me/read-manga/mr_100_perfect/
http://www.mangago.me/read-manga/lover_boy_lezhin/?syMu
I’mma ask again but pls recommend bls for exes to lovers. Like they broke up but then gets back together in the end. I fell in love with ‘Escape Journey’!!