What should i do

[pearlharbr]

Did he agree to end all contact with OW when he ended the A? Did you put a transparency plan in place? If not then I can see how he would think it's ok to continue communication.

If it's not ok with you then tell him that. And FWIW, it would NOT be ok with me at all. I'm with Dylan--if I found out that BF ever spoke to OW again then I would be out so fast his head would be spinning.