You and Theo were together for three years when you were still in school at Hogwarts. Theo cheated on you and you broke up with him. He thought he didn't care about losing you but in reality he did, he cared a lot.

It has been five years since then and it was your wedding day because you had found someone else. Theo was a guest at the wedding and he regrets everything. He has to watch the love of his life get married to someone else. You were getting ready in the back of the venue.