God gave you two ears and only one mouth for a reason, you should listen twice as much as you should talk.
Pick your battles carefully.
Don't bite off more than you can chew.
If the partner runs around with you, then they will run around on you.
Once a liar and cheat, always a liar and cheat.
Past behavior is a good predictor of future behavior.
Always use protection.
If protection is available, abstinence is your best defense.