I've known couples whose only source of intimacy was fighting with one another for their entire 50 years of marriage. When it comes to anger, healthy couples do things differently than unhealthy couples, or couples that don't last long in a relationship. Healthy couples build a trust with one another. The partner can hear it as a message about the sender, and not as criticism of them, so that they're able to respond in a compassionate, loving way, to the anger that's being expressed to them. That's what healthy couples do.
Conflict becomes an intimate act which brings the couple closer together.