Our first serious relationship is a rite of passage for many of us, and the lessons we learn can stay with us for a lifetime. Whether it's learning to be more patient, more understanding, or more confident, there's always something to take away from the first time you call someone your girlfriend/boyfriend. On r/AskMen , one user raised the question of what the men in the group learned from their first serious relationship . Many talked about heartbreak and betrayal, but the majority of men sha…