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He cannot sue you through his business in retaliation for personal issues between the two of you. Also, he can't go back and charge you for things you didn't ask for or things he gave you for free until your disputes began.
He's just mad and doing this for spite. A judge is not going to award him any money for work he did voluntarily. If he doesn't have a work order or a purchase order from you, he should not be allowed to collect.
Adam was great addressing my concerns regarding a conflict of interest situation. I feel more at ease with his expertise regarding my issue! Thanks!