I think the meaning in pretty straightforward, but I see somebody who is an alcoholic/druggy, and one time or another, he went on a kind of rampage and flipped out on his best friend (a girl, maybe even "more than friends") that has always been there for him, maybe she is just afraid of him now, but he decided to leave and maybe even go to rehab, or just quit cold turkey, but he just can't hurt her again, so he leaves without telling anyone, thinking it's the best for her... it may sound stupid, but that's my take :P
I think the meaning in pretty straightforward, but I see somebody who is an alcoholic/druggy, and one time or another, he went on a kind of rampage and flipped out on his best friend (a girl, maybe even "more than friends") that has always been there for him, maybe she is just afraid of him now, but he decided to leave and maybe even go to rehab, or just quit cold turkey, but he just can't hurt her again, so he leaves without telling anyone, thinking it's the best for her... it may sound stupid, but that's my take :P