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Exactly! And he probably took his medicine to do just that. And yeah as fabulousgirl(>__<)/ said I also think that he remembered the past when he heard the uke was an omega. I do agree though that it was bad of sensei to leave him with no explanation, but I think that was also to not hurt him, and so the uke wouldn't feel like sensei still likes him but only left because they're alpha and omega (=・ω・=)
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I know, and i also Think so, just that i think that is the way that his thoughts may be portrayed (=・ω・=) but I do a 100% agree that what he did made it worse and if he really wanted to break up (which we know he definitely didn't want to(づ ̄ ³ ̄)づ) without hurting him he should definitely have done it another way (=・ω・=)
he should stay away from the sensei, since he obviously thinks it matters that he's an omega. he's just as bad as everyone else