I don't see anything in the song that specifically implies this is about a girl cheating on him. It's about being wronged by someone close (not specific) who expects to just go about life as normal afterward. The writer feels deeply betrayed whatever happened and finds this attitude outrageously offensive. While the is willing to forgive the person who wronged him, he explains that things can never again be quite the same between them. The chorus "Does it run in your blood to betray the ones you love?" suggests that abusing people close to him/her must be a part of his/her nature for them to brush it off so easily and think things can go back to the way they've always been. For that reason, I really don't think it's about a romantic relationship. At least for me, I have no interest in being with someone who cheats on me. That's the unforgivable sin of love. Lust is natural, but to give in to it means you have basically given up on the person you are in a romantic relationship with.
I don't see anything in the song that specifically implies this is about a girl cheating on him. It's about being wronged by someone close (not specific) who expects to just go about life as normal afterward. The writer feels deeply betrayed whatever happened and finds this attitude outrageously offensive. While the is willing to forgive the person who wronged him, he explains that things can never again be quite the same between them. The chorus "Does it run in your blood to betray the ones you love?" suggests that abusing people close to him/her must be a part of his/her nature for them to brush it off so easily and think things can go back to the way they've always been. For that reason, I really don't think it's about a romantic relationship. At least for me, I have no interest in being with someone who cheats on me. That's the unforgivable sin of love. Lust is natural, but to give in to it means you have basically given up on the person you are in a romantic relationship with.