Like breaking up a marriage

Finances and infedility are 2 common reasons.

Money,
Immature
Getting married too early
Getting married for the wrong reason.
Not having a proper view and respect of the religious importance of marriage
Lack of communication
Refusal to get counseling when problems come up

Arguments over children - his, hers, theirs.

Arguments over in-laws - his and hers.

Different goals.