The chocolate I know is only given as a sweet gift between lovers on Valentine's Day. In normal times, it is just an ordinary candy and does not have any special meaning attached to it. If you feel uneasy thinking about it like that, just return it. But if the boy really has no other intentions and just wants to make true friends with you, he will lose a true friend of the opposite sex by doing this. If it were me, I'd better accept it and try to treat him as friends. If he really has bad intentions, it's not too late to refuse. So as not to miss a good friend.