Don't ask him to do anything that pressures him. If he's interested in doing a vow renewal, then I think it would be great. A couple I know who dealt with an EA on the wife's part and a porn problem on the husband's part had a vow renewal and second honeymoon and both said they celebrate their "new" anniversary much more than the old one.
The LORD is near to all who call on him, to all who call on him in truth." (Psalm 145:18)
