We have no idea whether you are male or female and what is the religion of the ?someone? in reference.
At the outset, we wish to point out that every type of premarital relationship is strictly prohibited in Shari?ah. Such a relationship falls in the category of adultery and is a major sin. According to the Shari?ah, it is not permissible for a Muslim female to marry a non-Muslim male. The marriage will be invalid. A Muslim male may marry a Christian or Jewish female only if he is able to preserve and practise upon his Deen. If he is unable to preserve and practise on Islam due to marrying a Christian or Jewish female, then it is prohibited to marry her.
It is not permissible for a Muslim male to marry any other non-Muslim female besides a Christian and Jewish female.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai