"for he has given out an evil name about a virgin of Israel": He has given out an evil name not only about her alone, but about all the virgins of Israel.
"and to him shall she be as a wife." We are hereby taught that he must "quaff his bitter cup" — even if she be lame or blind or covered with boils. If there were in her a thing of zimah (obscenity) or if she were not fit to marry into Israel, I might think that he were permitted to keep her as a wife; it is, therefore, written "and to him shall she be as a wife" — (connoting) a woman who is (halachically) fit for him (as a wife).