Here are some quotes about losing a friend.

Losing a friend is more painful than losing a romantic relationship. Anon

A friend is someone who can see the truth and pain in you even when you can fool everyone else. Anon

We’re not close anymore, but I’ll be there if you need me. Anon

The most I can do for my friend is simply be his friend–Henry David Thoreau

A quarrel between friends, when made up, adds a new tie to friendship–Saint Francis de Sales

Never do a wrong thing to make a friend or to keep one–Robert E. Lee

True friends stab you in the front–Oscar Wilde

A friend should be one in whose understanding and virtue we can equally confide and whose opinion we can value at once for its justice and its sincerity–Robert Hall

You can always tell a real friend; when you’ve made a fool of yourself he doesn’t feel you’ve done a permanent job–Laurence J. Peter