I think It's:　あなたあっての、私です,. means" It's all because of you".

this sentence isn‘t correct, it should be "anata atte no watashi desu" or something different. it means "Your existance is the reason of my existance" ... We usually use this sentence in the situation like this. If you worked for a boss for a long time and now the boss says he's leaving to the other company. And you say this phrase, "anata atteno watashidesu", usually means "if you weren't here, there is no reason I continue to work here" . It's very traditional way of thinking in Japan, like Bushi and Daimyo, or Enka.

Japanese English translation: あなた あって 私のです = there, you are mine