In India, there are no laws governing live-in relationships, but they are not illegal. A live-in relationship between consenting adults is legal under Indian law if the requirements of marriage, such as the legal age of marriage, consent, and soundness of mind, are met.
The court explained that under Indian law, a live-in relationship between consenting adults is legal if the requirements for marriage are met, such as the legal age of marriage, consent, and mental health. No provision permits or prohibits such unions.
Your colony members can’t prevent you from living in a live-in relationship and you have also the legal right to do it. Unmarried couples can live together and buy or rent a property and become joint owners. The Protection of Women from Domestic Violence Act, of 2005 also includes the right of partners in a live-in relationship to receive protection from domestic violence and abusive relationships.
I would suggest you to talk to your broker and the secretary of your colony and talk this matter out as you and your girlfriend are not on the wrong side and you are legally backed up too.