LeAnn Rimes ran errands in her neighborhood on Friday, and she didn't seem at all bothered by ex-husband Dean Sheremet's recent remarks about their nasty split. From her calm demeanor to her casual outfit, she looked totally comfortable when X17 photographers snapped her picture.

Though LeAnn has been happily married to hunky actor Eddie Cibrian since 2011, let's not forget that she cheated on Dean to be with her current hubby. And apparently he's still bitter about it! Dean, who was married to the country star from 2002-2010, recently chatted with Nat's Next Adventure and dished all sorts of dirty details about LeAnn's affair.

On the problems in their marriage:
    "I felt like I was never having my needs met so there was fighting. And I was so intertwined in managing her career that I didn’t know how to make the distinction between husband and boss, husband and partner, husband and manager… I was husband, father, friend, lover, manager. There were so many hats and I didn’t know what hat to wear when. Unfortunately, I think the business ended up destroying us. That passion for our marriage wasn’t there. The person that I needed to be, the person I should have been, I wasn’t. I wasn’t the person she came home to and unloaded on. And, then, of course, I was thinking, I haven’t done what I’ve wanted to do in over eight years."

On LeAnn's affair:
    "Never in a million years did I think something like that would have happened. The need for me in her life was so strong. There were things she couldn't do without me. She had her own phone but never used it. People would call me to get to her. Everything went through me."

So what was his first impression of Eddie?
    "I just remember being like, 'Oh, God, just another one of those Hollywood pretty boys,'" he recalls. "If you’re in a room with him, he’s probably one of the most charming people you’ll ever meet. But I wouldn’t trust him as far as I could throw this f*cking table. He just felt like one of those guys from the beginning. A total schmoozer. Very Hollywood. I never bought his shtick. But I wasn't worried."

When did he first get an idea that something was going on?
    "There was this bar that everyone hung out at after set and I remember coming down the stairs and seeing the two of them shooting pool together. I could just tell by the body language that everything had changed. She's shooting pool, shooting tequila, in a tight tank, tight jeans, over the knee boots and she's standing across from him, playing with the pool cue. All of a sudden, there was a huge shift. My stomach dropped. I literally felt like I got hit."

What other bitter words did Dean throw her way?
    "The dumbest thing she ever did for her career was divorce me, because we were such a good team. The last hit song she had was when she was with me."

    "She really lives on the adoration of others. I could be speaking out of turn but this is my perspective. She lives and dies on the perception of herself. I sympathize with that cause she's been famous since she was 12 years old so she doesn’t know anything else. In L.A., there's the paparazzi and that false sense of success, false security that you're still relevant. If you're in the magazines, then you matter. And that carried over to the divorce. She became even more 'famous.'"

Maybe it's time to move on? LeAnn certainly has!