I agree with the above. I would throw in that while this was going on, he may have seen her come closer to him when reacting to something you have done. So he may have called to get a reaction from you. Be careful.
OM, or trailer park boy, as I refer to him sent me a friend request on FB a while back. I really had to debate what to do. My original reaction was to invite him to a get together and the disappear him. When I calmed to down I just declined and blocked him. The next day the man of the family he lives with (yeah he is 38 and does not even have his own place) contacted me. He tried to be threatening and I did react a bit but then shut him down too. While I will never know for sure, IMO this contact was to get a reaction out of me. I have not told my WW about it, because I believe that is what they wanted me to do.
Me 41 W 33 M 2013 Suspect A 11/15 Confirm A 1/16 She moved out 2/14/16 Stepson 13 Stepson 16