What Saffie said it very good. Try to view ML like your the OW now. My H use to have hot heavy lunch sex w/ OW when it started. Seperate your thinking back to where you were dating. Make it very casual if you can.
Lately my H has wanted sex lunch dates w/ me and we meet at our house, but he still lives w/ OW. Just seems to be getting more detached? from OW?