Marriage with Muslim Foreigner

I would like to ask regarding converting of religion. 

I am Hindu, female, Malaysian citizen. I am going to marry a Pakistani, muslim man. If we want to register our marriage, must i convert to Islam first. then undergo nikah or can i just marry without converting. I have no heart to convert my religion but I love him so much. Incase, we went and marry in Singapore, is our marriage legal in Malaysia? Can we still stay here in Malaysia?