Advise a friend who responds to conflict by avoidance on why it is not healthy in sustaining positive relationship

Avoiding a conflict isn't healthy in sustaining positive relationships for a few reasons. One, if something bothers you and you don't say anything about it, you'll allow the issue to fester. Eventually, it may come up in the wrong way or at the wrong time. Second, if you always avoid conflict, the other person in the relationship will never know what you're actually thinking, which will lay the foundation for a shaky relationship.