I am not sure you will easily find one single word that contains both connotations (of enticing and eloping). I would express your sentence in this way
He seduced X's wife/girlfriend into eloping with him.
Longman defines the expression seduce somebody into doing something as
to make someone want to do something by making it seem very attractive or interesting to them:
- Leaders are people who can seduce other people into sharing their
Entice into doing something is just as good.
Certainly, eloping doesn't always end up in marriage, so you may consider saying:
He seduced X's wife/girlfriend into marrying him.
which would hint at the fact that the marriage was possible through an elopement.