noun
cheating heart; temptation to cheat
Refers to a person's inclination or desire to be unfaithful in a romantic relationship. Often used in contexts of emotional or physical infidelity.
彼の浮気心が原因で別れた。
We broke up because of his cheating heart.
浮気心を抑えられなかった。
I couldn't suppress the temptation to cheat.