Take her out, "just to talk" and let her know how much you need her, and how you would feel if someone else had her in every way especially physically?
Not good advice IMO. My 2bx freaked out when he discovered I was dating and he said to me "I feel like our relationship will really be over if another man completes you in that way.". My reaction was intense anger because while we were married his constant stance was that sex and love were two different things and sex was not important. But as soon as the possibility that I might have sex with somebody else comes up sex magically becomes the ultimate expression of love and relationship to him. So, my response was pretty much bitter sardonic laughter as I said "I find that statement pretty f*cking ironic coming from you."
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver
