It is very clear to you, too, that the Sunni boy wishes to become a Shia simply because he wants to marry you, so there is a vast difference between a person who will claim to be a name-sake Shia & a real Mu’min. This difference of faith between you & him may lead to disturbances later on. According to Islamic Fiqh, even if there is possibility of being misled or being badly affected, faith-wise, it is Na-jaiz (unlawful) for a Shia girl to marry a non-Shia boy. And love is not the complete criteria for a marriage. It has been observed that majority of love-marriages have disastrously failed. Apply your mind & don’t act under the influence of sentiments. We advise you to get married with a boy who is really a Mu’min & not one claiming to be a Mu’min.   _{Your Comment}