do u people believe in black magic??

i dont know whether black magic concept exists or not?but some thing happend to my brother..like he fell in love with a gal and all knows tht that gal is not a good gal.tht gal said she wants to takke revenge on my brother thats why she has done some black magic on him.initially we didnt believe but after some days we got to know that my brother also dont want that gal but something suffocated him like something forcing him to continue this relation..we are very tensed..we dont know wht to do?pls suggest if u ve some solution..