Man invites ex to upcoming wedding

DEAR HARRIETTE: Is it crossing the line if I attend my ex-boyfriend’s wedding? We have known each other for 16 years as neighbors. Despite breaking up three years ago, I recently received an invitation to his upcoming wedding. I am still single since our split, and his impending marriage came as a shock.

(Our breakup was fine; we broke up due to career priorities overshadowing our relationship.)

Wit…