Last Saturday, my friend Chris was having a party. My boyfriend and I decided to meet at Chris's house. I was waiting for the bus to go to the party when it started to rain. I wasn't wearing a jacket or a coat. I was wearing a special special for the party. When I got to the party I was cold, soaked, wet and very unhappy. Then I saw my boyfriend. What he was doing? First, he was chatting to a girl. Then, he was dancing with her. I was so angry. I left!

Past Simple -> Finished actions and situationsin the past.
Past Continuous -> Describing activites in progress in the past.