amstellite-
You have to keep in mind Spanish allows for much more flexibility when forming phrases as compared to English. Therefore, as you get a stronger command you will see the possible sentence variations without necessarily changing the meaning. It just depends on the speaker and in this case because it's a song, one can be very flexible with the lyrics for stylistic purposes.
The prepositional phrase
'de ti' is probably what through you off. Often it helps to rephrase the sentence. For example, I am sure it would have been easier for you if it were:
Dejaste que me enamorara de ti-
'de ti' at the end of the phrase would have made the meaning clearer.
-You will be able to play with the language more if you become more fluent.
This song is by Frank Reyes and the title is
T? eres ajena, which was (still is) a big hit for this artist.
Drcaycu gave the translation but you may of understood it easier with the example of changing the phrase.
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RacerX- wrong song. It's Frank Reyes-
T? eres ajena. Listen to the video.
-MP.