Tenant trying to leave during an active lease....?

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Hi BP! One of my units is occupied by two roommates, who both share the rent payment. Now one of the roommates called me the other day stating that the living situation is not working and he would like to leave, I was a little confused as a new lease had just been signed 2 months ago. The tenant even went so far as to find another apartment to live in and the landlord of that apartment actually called me for a reference on my tenant... to his surprise he didn't know the tenant had an active lease with me ( how surprising lol).  Should I let the one tenant go and re qualify the remaining tenant on his own ? (ie credit check the remaining tenant to see if he can sustain the cost of rent alone). All replies are greatly appreciated BP :)

PS: My property is in Montreal, Quebec Canada... tenant laws are great, landlord laws not so much