What does amas mean?
I think, in Spanish, if you say "me amas" it means "love me" and if it is in a question form "me amas?" it means "do you love me?"
This should be, -Entonces, si [me] amas como dices, ¿por qué no [me] has agarado? This means, "If you love [me] like you say, why haven't you grabbed [me]?" you is not a Spanish word. For the purpose of translation, the objective pronoun me was used. Many objective pronouns can be inserted in the place of me: you, him, her, us, them.