Hello my Love. I just passed through to tell you how much I love you, and whatever happens I'll never stop loving you. I love you so much and despite the many obstacles which surround us we'll go ahead because our love is greater than all of them. I love you baby, never forget that.
When you want to mean that you just come to someplace not with the intention of staying (just a quick visit), in English you say: I just passed by/through.
If you say: "I just came/called" may be understood as: "I came/called just a while ago"