Never make the mistake of thinking gentle means spineless. Boundaries are something we must all live by. If a friend takes the time to confront you, believe that it was a difficult decision. Then, let it go and move on... without getting angry. Human beings are not disposable. People aren't pets. When you are done with someone, God will remove them. Don't feel you have the need to throw them away yourself.
Matthew 19:19 Honor your father and your mother: and, You shall love your neighbor as yourself.