No friends with the ex! When I decided that I was going to marry DH, I changed my cell phone number. Actually, I changed carriers. LOL
I instructed my mother, friends, relatives, etc not to share the number. I'm very close to my ex's mother, but she honored my wishes not to share the number. I don't think I gave it to her until after we were married. DH knows how much I love her, and he's fine with our relationship. My prior relationship lasted over 4 years, and there was just too much tension when I decided to be serious about DH. He tried to be my "friend" but in reality he was just trying to sabatoge and keep me in his back pocket. No thanks!
I'm confident that I made the right decision. I'm pretty sure that we'll bump into my ex at a few weddings this summer. Hopefully there will be no drama and no tension. We're both happy with our individual lives, so we "could" be friends, but I prefer that we just don't.