My husband and I have discussed a 3-some with another woman.
We're ready to take the 3rd party plunge, but our problem is finding a person to join the mix. You can't just walk up to someone and say, "Hey, would you like to join my husband and I in 3-some ?" The question doesn't come up much in polite conversation. I'm fortunate that my husband is a sexually open person and is open to experimentation. It must be really difficult to get you ex out of your head. But, keep in mind, that this probably one the reasons he became an ex!!!!

You have the right to do whatever you feel comfortable doing,and
as long as you and your present s/o are happy, that's al l that matters.

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What is essential is invisible to the eye
Only with the heart can one see rightly.