My ex boyfriend newly wed wife called me crying,what should i do?

My ex has contacted me after two years of us being separated, and I refused to speak to him, because of our terrible break up. So instead of calling and reaching out I proceed to see how he was doing through Face book. I was so happy to find out......
that he had just been married. Also, due to fact that we have a lot of mutual friends, it allows me to know how he is doing. Most recently one of our mutual friends ask my how I felt about him dating a local girl that stays in my building. I said that I had no regrets, and that my boyfriend and I are happily engaged. Than, I explained that my ex is still a cheating useless human being, because he just got married, and now he is messing with a local girl as well. I would like to move on, but people just keep coming up to me and reporting my ex business. I have been in a very nice relationship with a man who loves me a lot for a year and half now. I was really piss when my ex boyfriend newly wed wife called me crying saying that she doesn't know why her husband has called me twice, and she wonders who I am. I proceed to curse her out, because I explained I have turned down any of his invitation. However, I could not bring my self to tell on my ex. I wanted to tell his wife about the woman he has been storing away, but parts of me still feels loyal to his friendship...... Now the wife calls me every day wanting to fight, when I have a beautiful relationship and the one the wife should be fighting, is the local girl from around the way who has been seen with my ex so much that they are known as a couple. Should I tell the wife who keeps harassing me that she has the wrong woman and point her in the right direction, or should I continue to entertain the shenanigan.