Too many things happened such as
the grudual development and final confirmation of the romantic relationship between Chandler and Monica, misunderstandings and funny events prompted by it,Ross's miserable second divorce and so on
I have to say in this season the most miserable one is Ross. He just conducted such an inconceivable and funny error at his wedding and owing to it the cracks between the new couple spanned which had already existed on account of the past romantic affairs of Ross and Rachel. Emily's strong desire for controlling and the extreme attitude she held towards Rachel kept escalating. Ross had only one unreasonable way to get her back that is to stop meeting Rachel.
However the happy and satisfactory life Monica and Chandler led cheered us up.
How did the six friends put up with other's bad habits and kept such good relationship.
Monica's over attention to the tidiness and cleaness, her strong desire for controlling other's behaviors and organizing things all by her own.
What's the secret and essential factors that sustained their good relations for that long despite all the conflicts that had taken place?
One reason may be that they had known each other already in the high school.
Another may be that they knew how to share daily affairs, good or bad.
They learn to forgive and having been given apology can remove the unpleasant events out of mind easily
If you don't feel good, just speak out your mind and let your friends know what you really think about.