It is extremely important to keep your friendships outside of your relationships. Your best friends, the friends who were there for you through crisis, will stay with you before and after your relationships. So it is important that you treat each other’s friends well. Accept them as a part of your other half’s life and make them feel welcome. You don’t have to like all of them, but treating each other’s friends with dignity and respect is a sign of maturity and caring about your partner.