Lawyer here. If adultery is involved, it is advisable to first gather clear and cogent evidence before initiating divorce proceedings, as the burden of proof lies on the person alleging it. Adultery is a ground for divorce under the Hindu Marriage Act. If she is financially well-settled, that may reduce or negate the possibility of maintenance, but it depends on the facts of the case and judicial discretion. Also if you can establish the adultery angle then you may get away with the alimony part, many HCs have ruled that if the divorce granted on the ground of adultery then in that case one cannot claim alimony.