Do you think that lack of Appreciation is the most common reasons marriages end?

In your example, it would be communication that is part of the breakdown.

Communication is key.

If you’re holding in all those unrequited emotions... you are just as culpable.

Sure, but often it's a lack of communication about what we want, need, expect, from our partners. Sometimes one feels neglected in some area of the relationship only to find that the other is also feeling the same way about a different aspect of their lives. Not everyone is naturally well tuned to the needs of another, it takes some practice and a commitment from each to reach a sustained level of intimate communication.

I think they fail because it's the common path to life. Get educated. Marry. Have a family. Then people just relax, because they've done that. Problem is you have to actually work to maintain those family relationships whether it's between hub/wife or parent and child. When one person gets lazy, shit happens

I think that most people believe that once they are in a commited relationship that they need do no more. A relationship needs continual maintenance - just like a car - and when this is neglected, it fails miserably - just like a car!!

I think marriages end because of several factors :

Lack of communication

Taking your spouse for granted and don’t show them the proper respect

Failure to continue to maintain ones appearance and remain physically fit and attractive

Lousey sex, lack of sex , unwilliness to try new things regarding sex

Some suggest our species are not naturally monogamous, if this were true it's an up hill struggle!

I can relate to this, so yes probably one reason for sure.

I’m not married but I’m sure it involves some type of neglect in an area that one person values and the other doesn’t.

Probably one part of the reason for most divorces, but not the only one.

Lack of communication and wandering eyes are the reasons for most...

why marry someone like that? What do they expect??