According to Jim (2001)

S5E3 The Tale of the Tape (2)

In "The Tale of the Tape (2)," Jim becomes anxious that Cheryl's romantic desires will grow after her brother-in-law, Ryan, impresses Dana with lavish gifts and flowers. As Jim grapples with these concerns, he discovers that the special blues tape Cheryl claims to have created for him during their courtship was, in fact, a gift from one of her ex-boyfriends. This revelation complicates Jim's feelings and raises doubts about the authenticity of their past romance.