Lots on my mind...help!

Crazy time right now and I have not been posting as much.  Plus I am struggling with something and I need to put it out there.  Last week on Glee (did you see it? the first Whitney song was the best of the season) there was some rumblings of Kurt cheating on Blaine based on a "texting" relationship.  As this is airing, I am listening to a co-worker who is upset about finding emails from her husband and another woman.  Is this cheating? 

The texting on Glee was flirty and fun and constant.  Chandler (the other boy) was crushing on Kurt and was flirting outrageously.  And Kurt was flirting back, acknowledging that this "other boy" was giving him something that Blaine was not. 

My co-worker found emails that spanned a year and even though the husband denies anything physical happening, the emails were constant and (in my opinion) inappropriate.  "Wish you were here", "love to see you in the shower" kind of stuff. 

So my question is, how mad would you be?  Is this cheating?  If you are relying on someone else to give you something that your partner cannot or is not giving you, are you being unfaithful?  And, is this enough to end a relationship?  I guess I am just wondering where you draw the line and once you step over that line, can you go back?  Anyone????

Cheating Website

I get the magazine Redbook monthly.  I know, I know its a "mom" magazine but I enjoy the articles and I like the recipes.  Anyway, this month there was an entire article on a cheating website.  Yep that's right, a website for the sole purpose of hooking up married people to have an affair.  8 million people on the site and the motto is "life is short, have an affair".  The website is called Ashley Madison.  Anyway, when I brought this up to the husband he made a joke and thought nothing of it.  Now I, of course, wanted a discussion.  Have you heard of it?  Have you ever checked it out?  Would you cheat on me? Are you cheating on me?  I know, I know but when I am having a "day" these thoughts go through my mind.  I do not believe that my husband would cheat but I want him to be as appalled by this website as I am.  It is maddening to me that I cannot get him to take the bait..anyone?