I would say she called because she is "nosy". Or maybe she is feeling the distance. You even said you nor your wife really talk to her anymore. So I am gonna go with "nosy" and/or looking for the "drama".
Think this the real reason for the call, b/f not being fed information from both sides, especially W who has cut down on contact since the start of year, since she stepped back into the M.
I don't touch W phone now it would cause too much trouble. Even when W tries to entrap me by leaving the phone in a room with me, I just shout her and tell her to come and get it. I'll most likely just say someone tried to contact after she fell asleep or say nothing. But really as I typed this I'm not really too concerned cos I've got a good handle on cheating behaviour if it is going on.
