Pretty much what everyone already said, but the lines
"But I'm waking up,
here next to you
I'll be thinking to myself what the hell did I do"
makes me think of this scenario:
He ran into her at a club, they got a little tipsy, slept together, and that line is him waking up and instantly regretting it.
After that one night stand, he realizes that she isn't good enough for him, so he finally moves on.
Pretty much what everyone already said, but the lines "But I'm waking up, here next to you I'll be thinking to myself what the hell did I do" makes me think of this scenario: He ran into her at a club, they got a little tipsy, slept together, and that line is him waking up and instantly regretting it. After that one night stand, he realizes that she isn't good enough for him, so he finally moves on.