But you said to me last night that HE was calling HER and you said that the calls only lasted 1 minute, and you said that that meant she was "not answering" the call....so now you found out that she is calling him and the calls last for 2 mins or so?

Seems you have two options here, Frank:

1) Call her on it and tell her that she's breaking your boundary

or

2) Quit snooping