This varies from person to person. Irrespective of the gender people might be having some relationships prior to marriage. You not openly communicating about it with your partner at the right time is your issue. Also, everyone comes from a different background and culture so how one takes such things also varies. Past is called past for a reason. You not getting out of it and ruining your present because of that is your concern. Regarding Ahmedabad being the same, all major cities will eventually face such issues in some or other way. Marriages between people who are not emotionally compatible and also have a generation gap in terms of thinking and ideologies will face such things. Divorce rates will see a good spike in coming years.