Close encounter today after 2 years silence

I haven't posted in here in a while. It's been just over two years since I last heard from the P in January 2014, a few months later I blocked her number and there was silence. I'd already begun my journey of recovery and I'm currently in a 12 step programme for addiction. The last 4 months have been great and I'm just getting to a place of self-acceptance, health and serenity. I'm finding out who I am and all has been going well. However today I decided to go for a run around the local park, on my way I saw the P walking towards me on the other side of the road, I turned and walked quickly away hiding down one of the side streets. I noticed though that she'd crossed over to my side of the road and then turned down a street that passes my road where I live. She basically walked past my road. In two years I've never seen her out walking her dog so close to my home.

What's worse is she saw me, knew it was me, she saw me turn and run and so that is why she crossed over and diverted her walk to follow my direction. I'm quite alarmed and frightened as I don't feel it was a coincidence. I'm also slightly disappointed in myself that I had mixed emotions, I was afraid but excited too. I was also worried that I'd offended her by running away when I shouldn't feel sorry for her at all. I know I wasn't imagining it, she saw me today and she's obviously not as indifferent as I thought she'd be because she followed me. I'm hoping that this is just a one off though, surely they know if you run away from them then that means there's no supply left? Just thought I'd share anyway, I have a self destructive streak and one of my traits is to get involved with people who aren't good for me, I thought I was over her but I'm annoyed that I still have a weakness there after all this time, can we ever reach a state of true indifference? Thanks for reading.