Lyric discussion by TheModernWalrus 

He wants to be with this girl but isn't sure if he loves her. I think the line, "she vomits down my rental tux" doesn't relate to her being drunk (although it could because he rented a tux which usually suggests a formal party) but more to her being ill. This could deter the writer from loving her as it may be a terminal illness but he still thinks "fondly" of her because of how close they are. Then "Remember what your heart is for" is the writer reminding himself that you love with your heart, whereas he is may be leading her along because he enjoys the sex. "I lay you down atop the baize" "snookered between the back cushion..." Sounds like a dilemma to me again referring to the previous point.

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