Since Rarity got depressed and shut down her boutique, Alex's life has become incredibly difficult. Why?

He got sick. He can hardly get out of bed. Plus, Alex has been worried about the fact that he is not thin, to put it mildly. Being sick, there is no way to solve this problem. We can say that now he is as vulnerable as possible both physically and mentally

And Alex definitely won't stand it if someone says he's not cool.