Dreams about ex-partners, especially those that recur over time, can often reflect unresolved feelings or reflections on past relationships. In your dream, the college reunion setting suggests a desire to reconnect with your past, both socially and emotionally. Seeing your ex in your parents' house could symbolize a longing for familiarity and comfort, as well as a connection to your younger self.

Your feelings of happiness upon seeing him, despite knowing he is married and that it’s "too late," may indicate that you still hold a fondness for the memories you shared. It could also reflect a sense of nostalgia for a time when things were simpler or a desire for closure regarding your past relationship.

Consider what emotions arise during these dreams and how they relate to your current life. Are there aspects of your past you wish to revisit or lessons that remain unresolved? This dream could be prompting you to reflect on your current relationships and what you truly desire moving forward. Embrace these reflections as a way to gain insight into your own emotional landscape.