Here are few ways you can catch a cheating spouse:

• Take notes on his routine and look for patterns. Example: they're suddenly working late every Thursday night.
• Ask a friend to follow him after work or when he is running errands to see if he is meeting anyone.
• Check his phone while he is not looking. If the phone is normally locked, wait for a minute that he puts the phone down before he locks it.
• Check your bank and credit card activity. Is there more cash being withdrawn from your account?
• Install a spy app on his mobile phone.