Dreams about past relationships, especially after a breakup, can often reflect your inner thoughts and feelings about the situation. In your dream, seeing your ex-girlfriend dressed nicely and smiling while ignoring you could symbolize several things:

1. Processing Emotions: Your dream may indicate that you are still processing your emotions about the breakup. The fact that she is dressed well and smiling could represent how you perceive her moving on or doing well without you, which might be a source of your doubts and insecurities.
2. Unresolved Feelings: The dream suggests that there may be unresolved feelings on your part. You are grappling with your decision to break up and the influence of family and faith on your relationship. Her ignoring you could signify the emotional distance that has formed since the breakup.
3. Desire for Closure: Watching her walk away might reflect your longing for closure or clarity regarding your feelings and the relationship. You might feel a sense of lost opportunity or regret, especially if you feel you didn’t fully explore your feelings before making a decision.
4. Symbol of Change: Her appearance in business attire could symbolize a desire for maturity or a new phase in life—yours or hers. It might be urging you to consider your own growth and the changes you are undergoing after the breakup.

Given your current feelings of doubt, it may be helpful to reflect on what you truly want. Consider journaling your thoughts, talking to a trusted friend, or seeking professional guidance to help you navigate these emotions. It could also be beneficial to think about what you want in a partner and how your values align with your relationship choices. Ultimately, trust yourself to make the right decision for your future.