squidward is mean to spongebob & patrick then nice is he bipolar

That doesn't make him bipolar. He just hates Spongebob 더 많이 than Patrick I guess.

I think whenever SpongeBob and/or Patrick does something that Squidward likes, Squidward is happy. But hey, SpongeBob and Patrick are always annoying towards Squidward 95% of the time, so he gets 더 많이 angry at them than being happy at them. Squidward's not bipolar. There are reasons why he switches from angry mode to happy mode.