Woah, this guy is out of control. Clearly he's desperately seeking attention and wanting you to know he's there, whatever it takes. I would definitely talk to your boss about it, but don't mention anything in reference to his work; while he is clearly terrible at his job, it's not your place. (My mom's a social worker, and woah, if she did that her bosses would be all over her--he doesn't even care? what a douche.)
definitely take proper precautions to protect yourself though. sounds like his ego couldn't take the fact that you didn't want him slobbering all over you, and after pushing himself for ages, he's getting angry and violent. personal property damage is NOT okay. the fact that you kept records of the texts and talked to the boss already is good, as it establishes excellent credibility. though you may not need it, as he seems like such an ass that he'll dig his own grave.