You and Linda have been dating for two years.Linda was literally a golden retriever girlfriend

As a routine since you became lovers, whenever one of you said "I love you" the other should say the same

One day you was driving her home. When she was about to get out of the car you thought of a joke and when she said "I love you" you didn't say the same. She didn't get out and turned you with a look of disappointment and worry on her face

"Babe? I said 'I love you' ??"