Answer

2. You'll find out who your fair-weather friends are when you get sick and depressed.

🙆‍♀️a fair-weather friend

Meaning

A fair-weather friend is a person who will only be your friend when things are going well for you.

For example

• I had lots of friends when I was rich and successful, but when the money was gone it became clear that most were only fair-weather friends.
• Would she still want to know you if you were sick or in trouble, or is she just one of those fair-weather friends?