Nia, I just had a quick refresh over your previous posts and I think you DO influence your fiance to do certain things. If it wasn't for you putting your foot down, your fiance would likely have his brother and girlfriend living with you. Not that you did the wrong thing!
Would I be right in guessing that your guy is fairly 'easy going' but torn between the opinions of a girlfriend and his mother?
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.