
I know that Rin wants to be with his fated partner but I find that so disgusting because he already knows his fated partner already has a mate that he LOVES even if they're not fated...and wanting to ruin a relatioship just because of selfish reasons is a big nono for me...
I don't like Rin at all, I find his behavior disgusting

No it is not disgusting. Rin had so many failed relationship he seems dumb but he wants to paired with too and he finally found his only alpha that wont abondone him but that alpha has a pair already it is heart breaking! Even it looks bad now but it is better to be done quickly. They will all going to be hurt in someways. Yuka nad kauro is not fated pair and still being pair is unstable and from what i see about yuka is he is not actually really happy with kaoru. And taiga is holding hself back because he already knows yuka os his one and only but he still holds himself because he is paired with otherone. It is really complicated situation.

Well... Rin's kinda pitiful too. He was a baseball player, I bet it was his dream but could not continue, and there was an indication he was gang raped. Yuka did mention that there were a lot of alpha males whom choses suicide when they knew they are omegas. Yuka was very lucky to have an Alpha protecting him from the start compared to Rin. Hence I also can somewhat understand Rin's side even though it really is insensitive of him.

Oh no, not a white lotus again ╥﹏╥

Ah! Now that you mention "white lotus" I'm reminded of all the times I ran into that phrase in Chinese novels and racked my brains trying to figure out what it meant. But now that you've applied it to this female character I think I understand EXACTLY what it means... Σ(  ̄□ ̄) (๑•ㅂ•)و✧ THANK YOU!! (づ ̄ ³ ̄)づ
I don't think that's just a voice fetish...HE'S LITERALLY SICK IN THE HEAD