This statement carries a sense of regret or nostalgia. "I Wish I Could Go Back To The Day I Met You" signifies a desire to revisit the past, specifically the day of their initial meeting.
The phrase "And Walk Away" adds a layer of complexity to the statement, suggesting that the speaker is contemplating an alternate choice they could have made at that moment.
In essence, this quote conveys a sense of reflection or second-guessing regarding the initial encounter with the person addressed. It may reflect a mix of emotions or a longing for a different outcome, but it doesn't necessarily indicate a negative sentiment toward the person themselves.