Okay I have a really bad memory but I don't think ml is THAT bad? I mean yeah there were t...

He toyed with mc's feeling towards him and he is so fucking ambiguous towards mc. It really makes me question if he truly liked the mc.

Yeah I'm not trying to defend him but I see it as he doesn't want him to fall in love with someone else so he keeps his interest on himself but also he is being rude so it won't go further than a crush(?) Because if he fells in love with someone else how can he make him hate the person he loves but if mermans interest is on him he can keep it under control and I read much more horrible characters and they didn't get this much hate so I'm just a little confused
(And sorry if I made mistakes or it isn't clear English is not my first language)

I feel like he did that out of spite at first because he felt left behind when mc left town and made new friends

I barely remember that part it's either I my memory really sucks or I read too much manga at the same time

True, I remembered because it was the first time he seemed clingy when mc told him he was gonna leave. Then he came to visit him and saw him laughing with his friends and he turned away, that's when he met the other guy on the bus. This story is going in a lot of different directions, I'm so lost frustrated at how all these events are loosely strung together.

For real this manga kinda makes me exhausted it has too many elements but none of them are main like yeah he is a merman also childhood friend also f*ckbody also colleague also under a curse also getting bullied by the other like one or two is enough but all of them together is just too much