What is coping?

I saw an old friend this weekend. We hardly ever see each other, barely contact one another but we slipped into the chat. The comfort of someone who knows you so well, for so long. She's never judged me, well not openly and she could see, I think she could, that maybe, maybe I'm just not quite coping.
The not loving my job was the clincher, I suspect followed by the eyes prickling with tears at times.
We discussed the possibility of post traumatic stress and we agreed it was possible.
I cope, but am I always coping?