I'm not condoning the rest of what the seme did, but it's unfair to judge him based on his sexuality. Speaking from experience, being bisexual can be quite literal for some: feeling only *sexual* attraction to more than just the opposite gender. There's another word for people who can also feel romantic attraction for more than just the opposite gender: biromantic. The seme only said he's bisexual; he's self-aware about not being able to feel romantic attraction for men too until the uke came along, though yeah, he shouldn't have used that to hurt the uke when breaking things off.
I'm not condoning the rest of what the seme did, but it's unfair to judge him based on his sexuality. Speaking from experience, being bisexual can be quite literal for some: feeling only *sexual* attraction to more than just the opposite gender. There's another word for people who can also feel romantic attraction for more than just the opposite gender: biromantic. The seme only said he's bisexual; he's self-aware about not being able to feel romantic attraction for men too until the uke came along, though yeah, he shouldn't have used that to hurt the uke when breaking things off.