Dear Annie: I’ve been in a committed relationship with my girlfriend, “Sarah,” for three years. We live together and have been discussing marriage. However, I recently discovered something that’s left ...

Retroactive jealousy refers to the feeling of intense and irrational jealousy about your partner’s past—whether it’s their previous relationships, sexual experiences, or personal history with others.

Dear Annie: I just read your response to “Thrown off by My Girlfriend’s Past,” the man who felt betrayed after finding letters and mementoes from his girlfriend’s ex-boyfriend. I liked your response ...