Roommate moved out without notice and more. What to do?

We’ve told the roommate numerous times his girlfriend cannot be over every night and not be paying rent because it is against landlords rules and also just not right for her to be living here and not contribute. We got home from work today and he moved out, took all his stuff, didn’t say a word about it to us. He... show more We’ve told the roommate numerous times his girlfriend cannot be over every night and not be paying rent because it is against landlords rules and also just not right for her to be living here and not contribute. We got home from work today and he moved out, took all his stuff, didn’t say a word about it to us. He took the internet box (was in his name) and had the power shut off to the apartment (also in his name). We’re pretty sure him turning off the power is against the rules since there are still people living there (power companies rules) and didn’t alert the landlord he was turning off the power (breaking contract). We’re going to the landlord and took pictures of all the trash he left in the bedroom and damages. What would you do and what do you think will happen? His name is on the lease and is obligated to pay rent.
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