Then I wonder if I'm one of those people possibly in denial of sorts. I mean - really, what do I have with this man? Lunch, sex, a couple of phone calls here & there. Big deal. Nothing substantial. Nothing. So what am I even doing here?

I struggle with this every day - so let me remind you what I remind myself - you have three children who deserve to have two loving parents raising them. You have a past, a painful but instructional present, and a fabulous future together. This is why we go through this. Besides, what would you do differently if you were to completely give up? I can't see how anything is different if we give up - I think it would be the same, just hopeless and therefore harder to bear.
Cheer up. You clearly have spunk and a lot of heart. That should serve you well in this endeavor.
erin
PS I really identified with your whole PMS bit - I've never had it in my life, then spent two straight days in tears last week (I mean it-I couldn't stop for 48 hours. It was awful.) I was actually relieved to get my period and realize the hormones were making me nuts. One wonders how the stress of separation is affecting our chemistry???