It's good to notify your friends about possibly harmful situations.
Sal just found out he is positive for COVID-19 this morning, but he has already made plans to hang out with a friend.
Sal really wants to spend time with his friend Tom and catch up on old times.
Sal decides to catch up with Tom on Zoom, instead of in person, and then play Xbox games online together.
Sal has Tom over to his house and doesn't tell Tom he is positive for COVID-19 and contagious.
Tom trusts Sal and feels positively towards his friend.
Tom gets sick with COVID-19 and becomes angry with Sal for not warning him about the illness.