Tbh i think seme wld have been normal if uke didn't go out with him without amy feelings n all. As we know seme never knew love nor had the chance to know abt it in any other way like friends family etc, so if the uke was jist a good friemd despite seme's confession then it might have given him a chance to have a close friend and later he might have moved on. Bcuz if u notice it, seme was obsessed but more reasonable until uke started lying amd ppaces doubts in him. Both of them didn't trust each other. Uke knew he was lying constantly which made him guilty of it which lead his to doubt seme's trust for uke. Basically he wanted clear signs from seme that he trusted uke no matter what. Its like a reassurance for him. And seme had trust issues bcuz uke was lying and i think deep down semem knew uke's love him was fickle so he jad this fear that uke wld leave him any time at any moment amd that itaelf made him doubt uke more. But uke should have stopped everything asap when he still wasmt feeling it after beeing with him for few months before all this lying stuffs and trust issues started even. Both got their problems but i hate it when someone cheats or even attempts it without caring. So the uke was almost a cheater until seme came at the right moment and worse of it all is bro didnt even pity seme but just needed someone to use in the name of "leaning on". Well at start probably he did pity but I'm sure soon after he just felt good having someone liking him despite how he acts
uke is an asshole for dating seme in the first place out of pity, he was young, vulnerable and didnt know what love is supposed to be since he never got it from his parents...??
but to be honest seme wouldve killed uke either way since he's crazy