Think about your relationship with them to figure out if a behavior or past action has upset you deeply. If you find yourself upset when they enter the room you need to resolve a conflict also be the bigger person always,you should feel comfortable approaching them for reconciliation. Respectfully communicate to them you should both take some time to calm down.Think about the root of the problem and what specifically you need to change. Let them talk even if you disagree because interrupting will only add to the conflict Its important for both of you to figure out the conflict you disagree on.