An annulment has little to do with what happens after the wedding. An annulment looks into whether there was valid consent at the time of the marriage. Valid consent requires knowing and intending to enter a marriage which is permanent until death, life giving, and faithful. While someone may “change their mind” later in the marriage, that does not invalidate the original consent at the time of the wedding.
While events and choices that take place after the wedding can give evidence of defective consent at the time of marriage, they are not in and of themselves definitive proof.
