You and the Pogues were at the Chateau. Everyone was minding their own business, for example you were making out on the bed with John B.

Topper, your ex who is still madly in love with you, passed by John B's house, and saw from the window what you were doing.

His blood boiled and he decided to put gasoline around the Chateau. Shortly after, he set it on fire, and the house began to burn.