Kochana_kiedy_cie_spotkalem -
Focus on how your life changed from "before" to "after."
Spotkałem (masculine form of "I met"). If a woman were saying "when I met you" to a man, it would be: "Kochanie, kiedy Cię spotkałam ." kochana_kiedy_cie_spotkalem
Since there isn't a single famous book or song by this exact title, here is a variety of ways to develop this content depending on your goal: 1. For a Romantic Message or Letter Focus on how your life changed from "before" to "after
"Kochana, kiedy Cię spotkałem, świat nagle nabrał kolorów, o których istnieniu zapomniałem." (My dear, when I met you, the world suddenly took on colors I had forgotten existed.) it would be: "Kochanie