Lyric discussion by schmidtybang 

I think the general meaning of this song is that he met a girl, and fell in "love" with her. She seamed so perfec, just like the trojan horse did and then once she got inside and he really liked her she broke him and hurt him. Even though he thought it was the one he has to start over again, reluctently. He changes all his thoughts and makes it harder for him to be hurt, convinces himself what she did was wrong, but he still always feels the love for her that he had. He changes the locks, but he can't change how he felt.

Exactly.

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