it was always just a game to him - you can see him smiling darkly on some occasions which kind of gives the indication he was never serious. examples of this are linked below.
its a tactic to get people attached to you. treat them sweetly, get them hooked, treat them like shit making them wonder what they did wrong while occasionally telling them sweet lies to prevent them from leaving, giving them the hope that the one who treated them so well, the one they fell for, will return.
http://www.mangago.zone/read-manga/hina_wa_mitsuiro_no_koi_ni_torawareru/mi/tr_chapter-3/pg-10/
http://www.mangago.zone/read-manga/hina_wa_mitsuiro_no_koi_ni_torawareru/mi/tr_chapter-4/pg-24/
I thought everything was going great with the two of them why did seme do such a thing? Was he stringing the uke along for fun? Didn't he have feeling for uke after a one night stand. Whats going on?
Yea the seme is a manwhore. uke deserve so much more, hope he find someone who treasure him more and the seme find someone else.