I need advice! Long story summed up. My SO got suspended from work for a week. What he did get paid…

I need advice! Long story summed up. My SO got suspended from work for a week. What he did get paid he gamble and paid $20 on a bill. He told he he had to pay people back he owed. Which is a lie (I check. His account) now he asking me for money! Do I show his tough love and tell him no! Or do I keep it to myself that I know the truth to keep the peace? Cause its not my fault he can't keep his mouth shut At work!