Michael Douglas dropped his bachelor tendencies when he began dating Catherine Zeta-Jones, since she is not one to tolerate infidelity, reported Starpulse.com.
The 64-year-old actor married the 39-year-old actress in 2000, and the couple now has two children together.
Douglas, who was also once married to Diandra Luker, revealed that Zeta-Jones made him promise to be monogamous at the beginning of their relationship.
The actor claimed that the night he fell in love with Zeta-Jones, she told him, "I know you’re a single guy and you’re entitled to do what you want. But if we’re going to continue this, then I just want to start with a clean deck. It’s got to be just me."