Being "the other"

First of all, my apologies for not having posted for the last 2 days. I have my excuses though;

Late night PS3 obsession!

Yesterday I watched a movie called "The Other Man" and I don't want to spoil it for you by telling what it was all about and how the story went. However, it shouldn't be extremely hard to figure it out. 

One married couple and another man. You do the math!

Below you'll encounter some series of fictional (maybe not) situations. (nothing to do with the movie)

Situation 1 

You sense that something is going on in your relation with your partner. In other words there is a slight chance that there is  an_"other" person and after a while you find out someone hasn't been as faithful as you were expecting. 

Situation 2

You find someone, start a nice relation - only based on satisfying each others' needs - a basic,  no strings attached kind of a deal. This time you learn that YOU've become "the other", that YOU've been helping that person to be unfaithful. Crap! You think to yourself "I would never want to be "the other" - because you know exactly how you felt after you found out that you and your ex-partner were having a trinogamy - "Should I put an end to this?"

But why would you do such a thing? Is it because of MORALS or are you afraid of KARMA?

Situation 3 

This is a good one... You meet someone else and this time YOU are ready to sign a consent form to become "the other" one. "God! How did I become like this?" Your guilt picks on you for a few weeks but then it's all gone. However, your belief in karma keeps making you feel uncomfortable.

So, what would you do in these 3 situations. Attention! I am not asking what is the right thing to do... 

Naiveness - selfishness - silliness - honesty etc... ?

L.O.V.E.

a.R.a.S