Abel seems to address the girl at this point in the song about how she’s impacted him. He knows he shouldn’t, and he doesn’t want to, but he can’t come over his lust.
In hindsight, however, his lust actually turns into love since this girl can relate so well to him, allowing him to actually enjoy every moment they have together for this short amount of time before she moves on. She makes him happy, something that’s strange to him and that he doesn’t seem to be fond of (“succumbed” has the connotation of weakness and surrendering). Succumbed could be directed toward the lusty, drugged up lifestyle that he lives and that he can see this woman lives…or it could be directed toward the emotions that have swelled within him.
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