The answer is a resounding yes. Infidelity can cause trauma, but it's not always what you might think. There are many ways that infidelity can cause trauma. The most obvious is when a person discovers that their partner has been unfaithful. The discovery could be accidental or intentional; either way, the result is often shock and disbelief followed by intense grief and anger. But sometimes the trauma comes from more than just the betrayal itself; it comes from how we perceive our partners' behavior and how we feel about ourselves in relation to them. When we are betrayed by those who are supposed to love us unconditionally, our identity can be affected by this betrayal in ways that aren't always obvious.