Friends are one of God's greatest blessings to us.
The Bible teaches a lot about them. It teaches that iron sharpens iron, that a friend loves at all time, that we should love our neighbors and that peacemakers are blessed. It teaches that we're better together, we need to hold one another accountable and we need to speak the truth in love. It also teaches lots more.
However the Bible doesn't advise (at least not that I've seen) when or if we should end a relationship. And if doing so is loving...or selfish and prideful. (I'm not talking about marriage which Jesus certainly talked about.)
The story of Paul and Barnabas is the closest I could find.
Paul and Barnabas were ministry partners and best friends. Yet in Acts 15 they had such a sharp disagreement they parted company. Barnabas took Mark and sailed for Cyprus and Paul chose Silas and went through Syria and Ciliicia (v. 39-40). I'm guessing hurt feelings and wounded pride traveled with them as well.
Even though this story occurred 2,000 years ago, it could have happened yesterday--probably because things like this DO happen every day. Our humanity gets in the way and friendships end.
Yet what surprises me most about Paul and Barnabas' parting is that God used the schism to strengthen the church and it grew as a result of their separation. It seems the dissolution of their friendship was actually a good thing.
Certainly you can think of a friendship that ended badly—perhaps to be reconciled later, but never to be the same. Maybe you were the one who walked away or maybe you were the one left behind. Rejection hurts. It's hard to see how good can come of it.
But what is one to do when sharpened iron cuts more than strengthens? When love, even with the best intentions, hurts. And when personalities cannot arrive at peace? Is it a loving thing to separate? Or does it still come down to a matter of pride and selfishness?
What would Jesus counsel us to do?
What would YOU do?