Your tenant is a con man, and the fake check deposited at the last moment clearly shows that these types of people do not play by the same rules as the rest of us.
You're not obligated to do anyone any favors, but if you decide to help someone, you must set boundaries and I think Michael S summed it up perfectly. Another option is to hire a management company since I feel most people would be more wary of trying something on a company vs an independent landlord.
Even the banks aren't so cut and dry because sometimes stuff happens. Banks have 15 day grace periods for late mortgage payments, and you still have 60-90 days to avoid foreclosure after a notice of default. To be fair, at least the bank can take control of the property to recover losses... landlords don't have much recourse beyond retaining the security deposit.
Glad you're going to report the tenant to the credit bureaus so that the tenant won't be able to scam anyone else.