You can definitely sue him for the money he owes you, assuming you can prove the existence of the debt (e.g. that you loaned him money which he didn't repay), his failure to pay as per the terms, and the amount still owing. You probably cannot recover legal fees, however; in United States courts, each party typically pays it's own lawyer costs, and the the plaintiff (the person suing) usually cannot get them, except in a few special cases (e.g. consumer fraud, wage and hour violations, if there's a contract providing for them, etc.). You may therefore wish to consider suing in small claims court, given the amount owed ($915), where you can represent yourself and avoid lawyer fees. Small claims court also tends to move faster than "regular" court, so you'll probably get a resolution more quickly.