Threats from Roommate

My question involves landlord-tenant law in the State of: Texas

I cosigned a lease with a roommate. The lease ends in 3 months, and he has threatened, in writing, to stop paying his share of the rent if I do not give him money. He has no legal claim to the money he is demanding.

He plans to leave the country in a few months, so taking him to small claims court would be a problem. I have his threat in writing. Should I try to get him evicted immediately? Can this be considered a criminal case? Can I put a travel hold preventing him from leaving the country?

Take the threat to local law enforcement.

Then go from there.

(No, you cannot do any sort of travel hold - if he wants to leave the country, the US will be absolutely fine letting him do just that)