In my case, my brother went out with a girl for a few months and they broke up, but on good terms.
He had a new years party and she was there, as was I. I saw him talking to her and thought it was about me. All night she was flirting with me. My brother took me aside and said I should play my cards right, as she was keen. I suspect he was trying to make it happen.
She was pretty, but I could never go there. All I kept thinking was "he'll have smacked his knob off her face" - something he said he liked to do. Called it a Slabberdash. She kissed me at the bells and I was really turned off at the thought.