Lyrics of the (Week)day!
'So please keep it in mind
Check on your friends
Every once in a while
Even if they say
I don't want anyone, know me or not
See me at my lowest, you don't have to drop, drop, drop
Don't have to drop by, nothing you can do this time'
~ At The Risk Of Feeling Dumb // Twenty One Pilots

This means, always check on your friends, no matter what they say. If you know something is wrong, check on your friends, as it is not worth losing a friend. Your message may just save a life <3!