If you are a Hindu boy who loves a Muslim girl and want to marry her should you convert to Muslim to marry her?

yes you should revert to islam if u want to marry a muslim male or female

Yes it is Required for Him to Become a Muslim First to Marry A Muslim Girl as Stated in Quran That

Al-Qur'an, 005.005 (Al-Maeda [The Table, The Table Spread])

This day are (all) things good and pure made lawful unto you. The food of the People of the Book is lawful unto you and yours is lawful unto them. (Lawful unto you in marriage) are (not only) chaste women who are believers, but chaste women among the People of the Book, revealed before your time,- when ye give them their due dowers, and desire chastity, not lewdness, nor secret intrigues if any one rejects faith, fruitless is his work, and in the Hereafter he will be in the ranks of those who have lost (all spiritual good)

Which Means that only People of the Books like Jews and Christians are allowed to marry with Muslim males

Please note that the permission for the Muslims to marry the people of the book is also conditional. Muslim men were allowed to marry the chaste and pious women of the Books. (The same permission doesn't apply to Muslim women).Many Muslim scolars feel this permission shouldn't be valid in the modern times and they have reasons for that. Muslims in general are prohibited from marrying among the people of other religions and specially among the pagans and idol worshippers.

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