Stand or flight?

I was a bit earlier this morning as there were issues with our trains (the speaker said something about Police action??). As I was walking down the street towards work in my own little world, I glanced up at a man who was walking by. Lo and behold it was one of my ex-boyfriends, Greg. The one who told me while I was sitting in his living room that he didn't love me and didn't see a future for us. The one who came to my apartment a week later with a LIST of the things he didn't like about me and then wanted to give me a hug before he left (uh, no.). My flight response immediately kicked in. I didn't want to stand on the street and have the awkward conversation about where our lives were now. I didn't want to know him at this stage in my life. So I put my head down and kept on walking...he didn't even see me. But after another block, I realized I silently wished him well. Because my life is so very good. And if he hadn't have broken up with me I wouldn't be where I am now (well, I might, but that's a 'what if' type of scenario). So on these warm summer days that slip into sweet summer nights I wish him well.

Have any of you ever run into an ex and had the immediate flight response?