You may have a lawsuit but will have to prove damages. Other than this being a juvenile prank for which he should be ashamed, unless you were harmed in some financially compensatable way, or unless he made you a victim of identity theft, there is a misdeed without harm. In which case you may win a judgment but no money.
Have your lawyer send a cease and desist letter. If that fails to curb the sophomore in him, seek an order of Protection and enforce any violations of that order to the fullest extent.
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I'm sorry that you are in that situation. The above response is spot on. The irony is that when I read his fake post it insults him more than you by saying that he 'can't perform anymore'. Not only is he a jerk, he can't even insult you correctly!Ask a similar question