I have had experience witht his...
And I can tell you from my experience, it is less likely that HE is involved in it, than the idea that it is just her.
She probably stalks his phone, as I have with My RAH, when he was a lousy drunk.
She probably has issues...
She probably feels threatened or jealous of you, OR she is being fed a load of crap about how much of a villain you are.
Either way, she probably figured out which number was yours and she gets loaded, and she gives your number out.
It doesnt seem likely that she would be doing that in front of him.
I just always found that the caliber of woman that my A would attract while he was drunk, at the bar all the time was just this type.
And there have been a few calls to my number late at night, however, ususally from a blocked phone .
One of these was from the psycho girl I have often mentioned. She had called me a few times, laughing on the ther line with her friends.
I actually told him about it, and he let her have it. He did not want anybody but himself doing drunken psycho Sh*t to me, LOL...