So...yaoi manga where the uke has unrequited love for the seme, uke & seme are friends, seme realizes that he is in love with the uke after the uke becomes close to other people/ some other person.
I've read: http://www.mangago.zone/read-manga/soredemo_yasashii_koi_o_suru/ (well, yeah, when seme gets to know that the uke has sex with other men despite being in love with the seme, he gets pissed off :D)
http://www.mangago.zone/read-manga/ashita_mo_tanin/
http://www.mangago.zone/read-manga/oko_sama_star/
Soooo...suggest me other stuff? Thannks! :D