End of season 1 Louis

On a rewatch and never really thought of it, but when Harvey tries to get a DNA test from Louis cousin ASAP to get an innocent man from going to jail for the rest of his life Louis denies Donna out of pure spite towards Harvey. Then tries to leverage it into a senior partnership from Jessica and only caves when Jessica tells him if he ever wants to make Senior partnership he will do it. He caves immediately.

Stuff like this and his abuse of everyone below him is why I can never truly like Louis despite his arc.