Not having marriage experience I probably am not the best to answer. Having had roommates for more than 2 years on several occasions we ran into challenges at times. The same occurs with co-workers having worked with some for as long as 20yrs. Maybe we could say communication with relationships? I dun'no . . .
Communication covers a wide gamut IMHO. How I communicate romantic love is not the same as how I communicate with day to day life. Those for me are different. Not every social exchange I would presume is centered around romance. Not that, that is the subject. C.S. Lewis wrote a nice treatise of the Four Kinds of Love:
Attraction or Storge
Friendship or Philia
Romantic or Eros
Unconditional or Agape
Relationships are founded on Love, said in some circles. Communication exists in all of those forms. Deciding which form of Love the communication is breaking down within is the challenge we may be discussing. And, their values and worth.
Maybe the guidelines for friendship is askew or has changed, yet ponder if Romantic Love still presides along with Unconditional. Loving a person unconditionally does not necessarily mean agreement of everything.
And, too, being a friend & having a friendship may be delineated by some. I am friends or have friendly relationships, yet most I do not have an intimate friendship with. By intimate I mean having trust and faith to discuss with vulnerability fearing no judgment my inner most feelings and thoughts. Friendship goes through stages as does Romance. They simply have ebb and flow.
I think, IMHO, that is where we discover many times a person of a marital relationship may have a different intimate friendship bonding with another outside of the marriage. Relationships exist outside of marriage. At times as with any relationship comparisons & contrasts are rendered between those.
EX: The marital spouse does not meet the standard of another intimate friend & vice versa. Difference occurs. Or, colloquially you are not as good a friend as so & so. Therefore, you do not love me as much. A conclusion is made the communication is at fault because communication intimately is better with the friend.
With the eye of an osprey one may discover, yes, communication may be lacking. Yet, is that communicated or lumped into marital love as being All Love? Maybe a friendship appears as lacking with the marital spouse, yet attraction, romance, & unconditional love is not.
Love is interesting, IMHO, it can be a puzzle & Life too.