Frankly, I suggest you buy a keyboard and learn to play piano.

This will not translate onto guitar well. You were responded to over a month ago on this issue, but there was no reply.
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lots of flirting with the other key without confirming. JUST LIKE THEIR LOVE IN THE MOVIE OH DAMN.
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you're acting like you have perfect pitch or something
You could play this on guitar, but it'll take a fair amount of time working it out. Not to mention it would be fingerstyle and a lot of barring - exponentially increasing the difficulty level.

If you're that keen you should see what notes the keys are playing in that video, note them down, then tab them out for guitar. Then work out what frets work out best for those notes, if you're only interested in playing the melody with no bass notes it's an easy piece. If that is the case, just work on transcribing the notes from the middle of the keyboard all the way to the right. It's time consuming, but not all that hard.
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