Greek 4 Four Years vs. Greek 4 Life

I was talking to a sister when I was visiting my chapter one day and she was telling my how she was going to deactivate the coming school year, because she just didnt think she was the "sorority girl" type anymore and all this stuff was going on in the chpater that she didn't care for (i.e cliques and a little immaturity going on and beleive me its lil stuff that every chapter deals with). She said it isnt what she thought sisterhood was suppose to be. So me not wanting to get into the whole "why bail when you can help to change stuff" debate, I said well, since its going to be your senior year next year, why not just try to stick it out or try to go alum? She asked me what the differences between going alum and deactiavting would really be and I tried telling her that if she went alum she could still do some stuff when she graduated from college and either moved to another city or back home. Then she looked at me and asked me something like, "Why would I do that? The whole sorority thing was only going to be something I did in college. I never plan on doing anything with it afterwards."
*SMACK*
When she said that, thats what I thought someone had did to me. I know everyone has a right to there opinions and stuff, but for some reason that comment pissed me off. But I just sat there and nodded and we faded off the subject.
I guess I got peeved because I was thinking, "Hello, didnt we both here the same thing about this being a lifetime committment or something to that extent, and when you become a member, you will always be one until the day you die unless you deactivate?" Like I said, I know its not going to be the same for everyone, and some will take it seriously and/or will be committed and others wont.
But it got me to thinking...
1) Is there a such thing as Greeks 4 Four Years and Greeks 4 Life?
2) Has anyone else had a conversation like the previously mentioned whether ist someone in their own house or a different one?
3) Can you decifer between those who are 4 years and those for life? (like when my non-greek friends and one of their GDI (I call anti-greeks those) boyfriends start asking questions and crap and I an example of one of our mutual friends who is in XYZ sorority and myself. Even though she hangs out with her sisters all the time after we all graduated from college. I wouldn't consider her a Lifetimer b/c of things I know.
And....
4) Would you consider yourself a 4 year or Lifetimer and by what standards? I know most of us would consider ourselves lifetimers, but Ill admitt probably at an early point when I was just getting really into it (even during new member/pledge period) I probably was a 4 year.

I know we've touch on this subject before a little in cretain threads, but I dont think we've ever fully discussed it (if we have sorry I was too lazy to do a search, sue me ). Let's be honest and please no hating on anyone

*sidenote*
The sister (who is one of my faves) decided not to deactivate after we held a fireside for our I-day and everything got emotional