Engagement to be broken

My causin got his engagement done 1 month back. After 1 month girl revealed the below statement 1.her father was hiv positive and died.they lied to us stating he died because of hepatitis b 2.girl had sugar levels above normal. 3.girl has harmonal issues and do not have regular periods. 4.she has given statement that family members have asked to lie with the boy who got engaged without knowing all this. 5.Now boy wants to break the engagement, but girl and family are not agreeing for settlement and threatening boys life. Our question- We have cal recorded evidence for all the above lies conveyed by girl and agreed. 1.will breaking up engagement is illegal issue, will this create police fir and will boy be put in jail. 2.if boy puts cheating case stating all this information was hidden n engagement was done, will case stands supporting boy? 3.what happens if boy gets registered marriage with any other girl without informing them. 4.will boy lose his job, works for IT company 5.what are the possible ways boy can call off this engagement, boy has nt touched her at all.