It depends on where you recorded it. If you recorded it in New Jersey, you would only need the consent of one party to make the recording. But, the location of the recording is what matters, not where you are.
Depends on where you recorded these statements. Each state has different requirements for determining the legality of recording someone without their consent. In New Jersey one party must consent to the recording. Best of luck.
Only one person needs to consent in New Jersey - invariably the person making the recording. "Trouble?" Being within your rights does not insulate you from trouble. It seems to me that if your ex finds out, she will find new ways to make trouble, either legal or non-legal. Plus, I wouldn't bother about the "friend" as it doesn't seem that she was your friend anyway but, your ex's friend and will probably tell your ex about the recordings (and that your are playing them for "everyone" not just her. Move on.