My friends crazy bf?... HELP PLEASE ANSWER!!?

okay so for the past few days my best friends bf been acting like a total douche bag, he hasn't been talking to her, and just kinda like he dont love her. but today he said that his ex was a wiken or whatever and is casting a spell on him to make be like that to her. me and her are like wtf. anyway hes acting like a 4 year old and blah blah, i think he lost his mine, anyway. whats going on here? and what can we do to fix it?