Direct Answer
David’s marriage analogy frames sin as harming a real relationship rather than instantly canceling it: a stumble strains the relationship and calls for repentance, persistent disobedience hardens the strain, and being “cut off” happens only after continued fruitlessness and lack of repentance—ultimately in God’s final judgment. He implies modern Christianity often swings to either instant loss (“ping pong”) or no serious consequences (“guaranteed heaven”).