You can sue the other roommate for the share not paid. If the other person has assets you may collect something. If not, you will likely spend more money, that apparently you dont have, and still not have anything to show for it. Sounds like you need to get a new roommate who can share the expenses and will pay them up front.
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Consult a real estate attorney. If the 2 year lease is not signed by the landlord and two witnesses you may be able to get out of the lease. You may email a copy of the lease to me for review at email@example.com
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You can sue the room mate for unpaid rent and also should try to mitigate the damage by putting out an ad for another house mate to replace the one that bailed out on you guys...