Whether its old friends or old relationships, the sooner you do, the better off you will be.

Over the years I've heard the follow great quotes regarding this:

"Build a Bridge and Get Over It"

"May the Bridges I Burn Light My Way"(my favorite))

"I don't Burn Bridges,  I just loosen the bolts a little each day"(This is what I do, when I know I should torch some of  these bridges)