I'm a student and I've co-leased an apartment with another person. It is a shared lease like students do all the time. My roommate leased another place and apparently he is not showing up for this place in spite he signed and agreed to the lease. What happens if he doesn't show up and doesn't pay his portion of the rent? I understand legally we are BOTH together responsible as it is a shared lease. But can I officially follow a lawsuit?
UPDATE: I'm in Illinois.