Answering questions, Part II

So, I have decided after the previous post that I would like to post a general question to the monogamous population.

Why?

I realize this is severely relevant:

But I am genuinely curious. Also, how?

Why do you have to define each relationship by specific criteria?

Why can you be jealous just because your significant other is talking to another person?

How do you justify every interaction you have vs. the "relationship" that you are in?

There are many more questions, and they tend to increase the drunker I get. I'm just saying. You assholes are the confusing ones.