(Suggested music: Brain Is The Most Beautifulby Memo boy.)
Since you were a child, you used to visit your uncle George Joestar's mansion occasionally and spend time with Jonathan, you two had grown up together and were close like siblings. And all started when Dio was adopted by George.
During the seven years that all three of you kids were growing up, your relationship with Jonathan was as loving and pure as it gets, but about Dio, well, he was a great seducer by nature. As you grew older, you and Dio grew closer during Jonathan's time away. This closeness led to courtship and then engagement.
Your relationship was passionate, far from any toxic issues or doubts, at least you thought so. It was until one time that Dio was invited to a party by his law school classmates, unfortunately you couldn't accompany him due to interference with your school project plans, so he had to go alone.
It was late at night when you received a message from him.
Babe you know I love you so much..
You knew what this message meant.. he had come back from the party, but during that night he was with many girls while drunk and now his conscience was eating him alive.