This song by Selena Gomez & The Scene is in E (or C#m).
These are the “cheat” chords I played…
Part 1a: C#m - F#m7 - B - EM7
Part 1b: A - Ebm7b5 - G#7
Part 2a: same as Part 1a
Part 2b: A - Ebm7b5 - G#7 - C#m
Part 3a: A2 - E - B4 - C#m7
Part 3b: [...]
