Ignore his plactating... As long as he keeps cheating openly you keep exposing it and speaking up for yourself and your family...
Btw, if it really stresses you out you can buy a cell phone jammer for 40 bucks or so at any IT shop... they will kill the cell phone signal within a pretty good radius of the jammer... much like going into a tunnel...
If the phone call just gets too much for you.. jam the sucker from the bathroom, he won't ever know.. keep the jammer in your purse.