Moan and groan
Complain, be dissatisfied
Withdrawn
detached, unsocialable
Be on nodding terms
Know somebody just enough to greet them
Myriad
a vast number, a lot
On the same wavelength
Have the same ideas, interest and opinion about something
Through thick and thin
In good and bad times
Fall out with
Suddenly stop being friends
Nostalgia
Happy thoughts or feelings about the past
Stand by
Support someone in hard times
Take off
Quickly become popular
Void
A large, empty space
Hit it off
Quickly become friends
Best friend
A very close friend you trust
Viable
Possible to do
Online Friend
someone who you only keep in touch with on the internet