Wife no longer in love with me

[cam]

So I had a girl contact me through facebook that I used to see 10 yrs ago, wanting to catch up. I'm not sure what to do, or what the rules are on dating, if that's what it even is. She is a nice girl and we got on great, but I'm so confused. The only girl I want to be dating doesn't want to know me.
I don't know if it's part of the moving on process or it will just make things worse as I will be comparing her to my W the whole time.
Any thoughts on whether this is a smart or dumb move??