The phrase "I miss you a little" acknowledges that missing the person starts as a subtle and minor feeling, perhaps something the speaker initially didn't pay much attention to.
The addition of "I guess you could say a little too often" suggests that over time, this subtle longing has become more frequent and noticeable. It implies that the speaker is gradually realizing that their thoughts and emotions often drift to the person they miss.
The concluding part, "and a little more each day," beautifully emphasizes the progressive nature of their emotions. It signifies that with each passing day, the depth of their longing grows, creating a sense of increasing attachment and affection. In essence, this statement poetically captures the idea that missing someone can start as a small, almost insignificant feeling but can gradually intensify over time. It beautifully conveys the notion of a growing and enduring sense of longing for the absent person.