You know, I would just drop the subject of the phone calls for now.
Even H's who are definitely reconciling often go through a period of having trouble letting go of contact with the OW. In my H's case, he was home, writing me incredibly loving letters, telling me how sorry he was - yet still took a couple of months to send a letter to OW telling her not to contact him anymore. It's almost like it's their security blanket - just in case things don't work out with us - or some of it is they just can't face telling the OW the truth. After all, he's just spent all this time telling oW his marriage is over and how much he cares for her - now he has to tell her it was a lie, he loves his wife??? It's just hard to do.
I'm not saying to accept ongoing contact - he DOES need to stop communicating with OW - but just recognize that it does take some time. Focus on YOUR R right now - you can call him on the contact issue if it hasn't stopped in a couple more months.
