There's one thing I want to share with you.

I was once married and she ended up leaving. I learned shortly thereafter that there was an OM. I was devestated.

I feel into a deep depression, started drinking and smoking pot just to make it through the day. Eventually I recovered and met someone.

It was almost to the day that I developed strong feelings for my new girlfriend that my Ex started contacting me. It was surreal!
My ex LOST HER MIND! Stalking me and my girlfriend, threatening suicide etc. Threatening to take my kid away. It was insanity in the truest sense.

The point is, let her go. She may come sniffing around, and when that happens, YOU will be the one in control. I wouldn't be surprised if your ex reaches out one day. Not surprised at all.