Do you groan every time you have to meet a certain friend or colleague? Do you feel like you are doing things because you have to, not because you want to? Some relationships can actually be a source of stress. True, you want to support friends who are going through a tough time. But if a friend is always in a negative place and doing nothing to help him or herself, it may be time to break free. You may want to rethink your friendship if it is adding to your stress.