I can tell you that in real human relationships, the decision to break up after having a physical relationship can vary significantly from one couple to another. Sexual intimacy can be an important aspect of a romantic relationship, but it's not the sole determining factor for whether a couple stays together or not.
Relationships are complex and influenced by various emotional, psychological, and situational factors. People break up for many reasons, including issues with compatibility, communication, trust, values, and life goals. Physical intimacy can be both a reflection and a factor in the overall health and dynamics of a relationship, but it's not the only element that leads to breakups.
It's essential for couples to communicate openly about their feelings, expectations, and concerns to ensure a healthy and mutually satisfying relationship. Building a strong emotional connection and understanding each other's needs are crucial for the success of any relationship, regardless of whether physical intimacy is involved.