There are a lot of reasons we avoid conflict, the obvious being that it just doesn’t feel good. It can also be an outdated strategy from childhood, if the people In control didn’t handle conflict well or were abusive.
But, if you are in a safe and secure environment as an adult, conflict doesn’t have to be feared or avoided. Although those avoidance strategies make sense, the truth is, that if you avoid conflict by ignoring it, you are hurting the relationship and the other person far more that if you were to engage healthily with them.
There are a lot of tools you can cultivate to resolve conflict, including working with a therapist to heal past trauma and practice effective ways of communicating.