Here you go! In some of them they break up & in some of them they are forced to stay apart. Hope you find something worth reading-
http://www.mangago.zone/read-manga/doushite_namida_ga_derunokana/
http://www.mangago.zone/read-manga/totally_captivated/
http://www.mangago.zone/read-manga/love_mode/
http://www.mangago.zone/read-manga/complex_manda_ringo/
http://www.mangago.zone/read-manga/yuuutsu_na_asa/
http://www.mangago.zone/read-manga/usagi_otoko_tora_otoko/
http://www.mangago.zone/read-manga/not_equal/
http://www.mangago.zone/read-manga/michiru_heya/
http://www.mangago.zone/read-manga/new_york_new_york/
http://www.mangago.zone/read-manga/usotsuki_wa_shinshi_no_hajimari/
http://www.mangago.zone/read-manga/hageshii_ame/
http://www.mangago.zone/read-manga/koakuma_no_sanctuary/
(one of the pairs)
i want a yaoi where in the beginning they hv a lot of hardship, they separated n broke up, or whatever that make u feel sad or angry somehow, but in the end they got together n be happy...