http://www.mangago.me/read-manga/puchitto_hajiketa/
http://www.mangago.me/read-manga/hatsukoi_no_atosaki/
http://www.mangago.me/read-manga/hageshii_ame/
http://www.mangago.me/read-manga/tsuki_ni_hoero/tr/98823/page/116/
http://www.mangago.me/read-manga/shiranai_kao/ (they weren't really a couple, but did some h stuff in the past)
http://www.mangago.me/read-manga/doushite_namida_ga_derunokana/ (they part and then get together a couple of times)
http://www.mangago.me/read-manga/nekasenaide/ (last couple- from ch.5, but the stories are connected)
http://www.mangago.me/read-manga/trap_ootsuki_miu/
http://www.mangago.me/read-manga/ruriiro_butterfly/
http://www.mangago.me/read-manga/koakuma_no_sanctuary/ (1st couple)
http://www.mangago.me/read-manga/deep_flower/
Sekaiichi hatsukoi!! Totally cute!!!!!!!!!!!
http://www.mangago.me/read-manga/kishidou_club_bangaihen/
http://www.mangago.me/read-manga/doubt_nishimura_shuuko/
http://www.mangago.me/read-manga/star_na_koi/an/star-na-koi-chapter-8.html/4/ (part 1)
http://www.mangago.me/read-manga/star_ni_ai/mf/v01/c003/2/ (part 2)
http://www.mangago.me/read-manga/priceless_honey/ (chapter 2)
http://www.mangago.me/read-manga/honoo_no_suna/ (chapter 3)
http://www.mangago.me/read-manga/konna_otoko_ni_dare_ga_shita/ chapter 1
Any yaoi manga where at first they are lovers then broke up, never seen each other ever again and several years later meet up once again , realize that they still love each other and get back together?