Try these (๑•ㅂ•)و✧
http://www.mangago.me/read-manga/iyayoiyayo_mo_kiss_no_uchi/
http://www.mangago.me/read-manga/special_relationship_law/
http://www.mangago.me/read-manga/hogu_hagyeongsu/
http://www.mangago.me/read-manga/well_done/
http://www.mangago.me/read-manga/detain/
http://www.mangago.me/read-manga/koisuru_boukun/
http://www.mangago.me/read-manga/paid_fujoking/
http://www.mangago.me/read-manga/musebenake_junjou/
http://www.mangago.me/read-manga/love_bite_lamyo/
http://www.mangago.me/read-manga/hello_im_your_stalker/
http://www.mangago.me/read-manga/warehouse/
http://www.mangago.me/read-manga/1305/
http://www.mangago.me/read-manga/lack_of_love/
does anyone know any manga or any story when the couple or friends used to be really good friends/co workers and then years(a long time period) later they spilt up and turn into enemies?