Unforgiveness, unresolved conflict, assumptions, comparison, silent treatment, lack of affection, Taking each other for granted, no more quality time together, disrespect in private, in-law interference, uncontrolled temper, lack of appreciation, sexual neglect, lack of financial transparency, ignoring emotional needs, bitterness hidden under smiles, phone addiction, lask of personal growth, disconnection during crisis, mocking each other’s weaknesses, overfamiliarity, lack of fun and laughter and lastly, neglecting spiritual intimacy.
Cheating, looking down on your spouse
And also listening to outside voices rather than discussing it together as couples
Cheating is too common now adays
Family and or friends become to involved in your marital business.
Outsider involvement
The one I think is number one and that is really not addressed properly abuse physical and mental it is talked about but not ever been changed it still happens. Cheating is common and is excepted by many in fact it is used for the reason to cheat knowing full well two wrongs dont make a right. Marriage is sacred and treated as such and shouldn’t be taken for granted.

Untold past secrets make sense