Responses
http://www.mangago.me/read-manga/i_wanna_die_before_i_m_30/
It’s not exactly a “ex lover” but it’s cute and contains so yaoi and smut
http://www.mangago.me/read-manga/there_s_no_way_this_is_fate/
http://www.mangago.me/read-manga/there_s_no_way_this_is_fate_newlyweds_arc/
Those ones about these three boys that go to school together and are best friends
(It’s a omegaverse)

I'm looking for a romance with a love triangle between a new lover and an ex lover it can be bL or Shoujo doesn't matter. Ive already read "back to school" and "ways of parting" Plz Anyone if someone could recommend me something id be very thankful