Meaning of "It Don't Matter" by Def Leppard

The song "It Don't Matter" by Def Leppard seems to be about a person who is self-assured and unbothered by the actions of their partner. The protagonist is depicted as being in control of their own life and emotions, despite the reckless behavior of their partner who is seeking thrills and excitement outside of the relationship. The repeated chorus of "It don't matter" reflects a sense of indifference and resilience in the face of a tumultuous and uncertain situation. This could suggest that the protagonist values their own independence and self-worth, refusing to be affected by someone else's actions or decisions. The lyrics convey a message of empowerment and self-assurance, asserting that the protagonist is not dependent on their partner for validation or happiness.