תרגום - אנגלית-ספרדית - if you feel like leaving I wont beg ...

It's unusual "partir" in this kind of expression, the best will be use "irte" ... for me the expression will be: Si quieres irte, no suplicare que te quedes.

leave = partir
go away = irse

CC: Krovitz

The expression is ok if translate it literally, word for word, what I try to said is latin spanish use more "irte" not "partir" in this type of expression. What ever I thing both options are ok.

I would have choosed some others words in spanish to give a better translation

I agree, a Spanish speaker would rather say "Si tienes ganas de marcharte, for instance. But there is nothing wrong with the partir verb, so I'm validating this translation. Besides, it's a "meaning only" request.