To everything there is a season, and a time and purpose under Heaven -

This applies even to friendships.

Not every friendship is a lifelong keeper, and I have found that when God closes one door to a friendship, he always opens another door to an even better friendship that is intended to support his viewpoint of friendship which is to offer Support and promote Growth of EACH person in the friendship

Two are better than one, because they have a good return for their work:

If one falls down,
his friend can help him up.
But pity the man who falls
and has no one to help him up!

Ecclesiastes 4:9&10 (NIV)

You use steel to sharpen steel,
and one friend sharpens another.
Proverbs 27:17 (The Message)