Sayyed Mohammad Al-Musawi,
Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to religious questions. In the past, he has also spent significant time in India guiding the community.
Muslim female is not allowed to marry non Muslim man under any circumstance. Your marriage with non Muslim man was valid when you were non Muslim. The time you became a Muslim, you must give him the option to become a Muslim, then he can continue with you as a husband. f he refuses to become a Muslim, the marriage bond between you (Muslim) and him (Non Muslim) is finished.
You need then to keep Iddah of Wafaat (four months and ten days), then you are free.
I advise you to respect the law of the land as well and do not do anything which is against the law of your country.