What can actually be the reason behind unhappiness in marriages over time?

Couples have too many expectations from each other and the inability to adjust and accept each other's weaknesses is a major problem in relationships.

Not trying out new things and routines also makes the relationships stale and boring.

Lack of Communication between couples is a major problem. Marrying your friend is basically to guarantee adequate communication and relativeness.

All the married woman I interviewed, 80% actually wish they were single due to unhappiness in marriage.

What you think can be the reasons for these and how do we bring back the spice in marriage 💑?

Drop your comments and suggestions 

Thank you!