First we get a person A scolding a person B for not being up to some idealized picture of "B", which A has in their head.
Then A does some shitty (i.e. murderous) things to a person C, because A doesn't like that B and C are falling in love with each other.
When B and C fall apart and B is struggling, A pushes their idealized picture of "B" on them again saying they wish B were dead rather than not being up to that picture. Oh, and the best part - A claims that they do all this because A loves B and knows them better than anyone.
A lot of shit comes and goes as B spirals to the bottom and takes people around them with them. B and C reunite.
And now we see how C starts looking up to A and seeking their approval. I mean what the heck?! What are you doing?! Why?! Is this the route the story goes? Really? Or are we meant to believe that A is fundamentally transformed (into a seagull) now?