If I were you I'd keep reporting it and save all evidence of him contacting you (the PMs from facebook).
Don't back down, keep reporting. Oh and please inform the principal that he emailed you when he was sent home.
Yoda did a most marvelous job of telling you what your options are. 
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“In depression . . . faith in deliverance, in ultimate restoration, is absent. The pain is unrelenting, and what makes the condition intolerable is the...feeling felt as truth...that no remedy will come -- not in a day, an hour, a month, or a minute. . . . It is hopelessness even more than pain that crushes the soul.”-William Styron
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