Depression

A chemical imbalance in your brain causing a constant numbing feeling of sadness. Which can also leave a feeling of loneliness and self hatred. You don't have to be bullied or grow up in a broken home to feel this way, depression doesn't care how you look, how much money you make or how you're treated. Depression can affect anyone.

"Wanna hangout later today?"
"Sorry I can't today but maybe some other time"
They are not busy they just feel like they're depression has taken over and they aren't worth anything to hangout with friends.