Nothing wrong with a little flirting. Just try not to get disappointed if it doesn't turn into more than a series of "flings" if you let it go that far. As long as the OW is in the picture that is as far as it can go -- a "fling".
I was often able to achieve "flings" in my sitch and I doubt that I am even a quarter as good at flirting as you likely are. In fact I'd bet money on it lol!
Still, flings have to be a good start -- right? I gave up after seven reconciliation attempts (which resulted from 14 flings btw -- I did keep track) and two divorce attempts, but I didn't have to.
I could have continued on, but I didn't feel obligated to and the OM was still in the picture. That is a showstopper when it comes to reconciliation -- but certainly not flings.
Unfortunately, I had no proof of the OM prior to me being done, so a "no contact" was never formerly implemented during our last reconciliation attempt.
Could I have eventually salvaged my marriage? Perhaps, but not without more cost than I was willing to endure. Instead I choose to heal and move on. Not the path for everyone perhaps, but it is the one that I chose for myself (and I certainly don't regret it).
I wish you the best no matter what path you choose -- you certainly deserve it!
