Stalking by wife to husband

My brother is very much disturbed when he comes to his house after work , there is no peace & hormony in his house,due to this my brother way of talking becomes rude,he does not talk politely & fight starts in house, they married for 13 year,& 12 years one daughter living with them,in own flat house which is in loan paying by husband, wife is not working from past three years, she is house wife & taking care of her daughter , no income from wife side,all the expeancess taking care by husband,there is no dout of less in all manner,everything is providing, the reason i asked my brother what is going on & what is wrong,he told us that his wife is suspecting that he having affair with other womans, she has told all neighbors & colleagues, & moreover she is stalking him were ever he goes by keeping agents to inform her by tracking his car & recording his phone & taking photos & videos, we tried counseling & reconciling, with our family elders & other out side well known experienced elders, but no use, she going on stalking him,& she is complaining that his friends are not good they spoiling him & asking him to cut all the friendship,,& after i have seeing the photos & videos we came to know there is no concrete evidence or proof,that my brother is wrong person , please kindly advice us what legal actions can be taken in christains legal laws or direct law & can we file in mental cruelty & Artical 21, in fast divorce, kindly gives some solutions,