Fair-weather friend- someone who is your friend only when things are going well for you
See eye to eye- to agree, to have the same opinion about things
Clear the air- to eliminate emotional tension, to remove bad feelings between people
Get on like a house fire- have a very good and friendly relationship
Two peas in a pod- very similar, especially in appearance
Through thick and thin- through good times and bad times
A shoulder to cry on- someone who listens to you when you are upset
To be in the same boat- be in the same situation