What is relationship?

I wonder if as we evolve as a society, if we will evolve our definition of "relationship".
As time marches on, or more to the point, the sun makes laps around the Earth, would we evolve and realise that the way we make out what a relationship is, is so outdated.
I am finding more and more that with this venus retrograde and all the planets right now doing their thing that, indeed things are coming to light as the astrologers projected they would. 
I see it with friends and their realtionships, I see it as well with the relationship I have with myself.
As I struggle to keep my ethics, or the rules I have created for myself to live by, in check.
Honestly, I am not sure how much longer I can keep inside the box I have built for myself.
Is being monogenous enough?
Are we built for more as a human species?
Where is the line in the sand drawn?
And is it different for everyone?
Are those Instagram couples really happy together?
I wonder about these things.

I wonder if having just one man in a womans life practical?
I mean is it even reasonable to assume he is capable of forfilling all our needs?
Should we even expect it?
How much should we fill our own needs and how much is it even practical to ask of another to for fill us?

Relationship with another is a delicate balance of finding out where you stand with the other, and keeping them happy.
Or is it?
Should we just focus on those we completely mesh with until we just don't mesh anymore?
And what triggers this meshing to come undone?
At what point do hurt feelings happen and the unravelling of this relationship begin to happen?

It is really a dynamic, moving, living being.  This exchange of energy, this dance we do through life with others.

Some friends I have had a few months ago, no longer meet up with me when I ask.  Something always comes up. 
When should we stop trying and realise that indeed its the universe moving them away from us.  Our vibrations are just not meshing any longer.  Can we accept that fait and move on?
How solid is the relationship with ourselves that we can stand strong with the decision to move forward and not bother continuing to try?

These ethics we place upon ourselves, especially me - where I am always trying to damn hard to behave - at what point did this begin and when will it end?  Will the surrender into a "bad girl" era really bring me the peace I crave?  Will it really scratch this itch that is driving me fucking insane? 

Is it really ethically so wrong to want to suck the cock of my husbands friend for no reason other then she doesn't do it and he hasnt had a blow job in 10 years?  Like what the fuck is wrong with me?  Or is just the chase that I am after?  I don't even know anymore.