The melody of I Cross My Heart by George Strait runs 264 notes across 26 bars, 2:56 long in Ab at 66 beats per minute. The tab sits low on the neck, mostly under the fourth fret, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? I Cross My Heart chords and lyrics.