Happiness is different from satisfaction, or a sense of completion. Happiness is more about having a sense of internal balance than believing that everything is dandy, and your own personal universe couldn't possibly be any better. It's about knowing that there's more work to do, but feeling up to the job; and in the meantime not cursing God or Fate or your girlfriend or your crappy upbringing (whether you had one or not), for what hasn't been done so far.
This is where it's at with me. I have good friendships for the first time in years; but I lost my true love three months ago, and I certainly could use a little more company as the long nights are drawing in. Which is the way it was, pretty much, when I had my true love--except back then there was a kiss and a cuddle sometimes that made me forget all the loneliness for a while. Now, though, I feel a little sad when I sit here on my own with some lugubrious country blues on the stereo behind me, and I wish that a friend would call or an unexpected email would arrive, but I know that in my sadness, or lonesomeness, as the country singers define the condition more correctly, there's a clarity of vision that will help me create the future I desire. I feel it, I go and clean myself up, I washes the dishes, put clothes in the washing machine, lift some weights, and I know I'm more ready.
Happiness makes me grateful for the things I have got and sturdy in the pursuit of things I want.