I have been in a relationship with a man for over 35 years but only married for 21 years. We have two children, 26 and 19. I recently found out he has been working with a woman he was sleeping with while we were dating. They have been talking after work. Plus, he calls her when she is not at work. He said it's just to say hello and check up on her. He deletes his call log but I still see the phone bill with all the calls. Of course he keeps his phone on vibrate. I also found out she wasn't the only woman he slept with. What should I do?

-Secretive Phone Calls With Ex