It's been well over a year since my divorce and a long tiome before that that we split up and my wife is now with another man and pregnant by him.
She lives in another country, but when I see her or even talk to her on the phone I do nothing but wish I hadn't made the stupid errors I did. But I do live in hope that this will pass, cos it's no fun at all, and I do believe that it will and that inevitably the right thing has happened for at least one of us and the other will just have to get on with it and grow from our mistakes.
So yeah I think it's prefectly normal, but I'd caution against acting on the attraction though.