jeez i dont even think u can fix it. u can go to "michaels" (if u have one where u live) or any other fabric store and get a leather patch in almost the same color. it will be noticeable but nothing as close to what u got there. look for one with adhesive on the back, so all u gotta do is stick it over it.
again it wont be perfect but id prefer a patch than a hole, if u ask me.
edit: if the whole ripped piece is int act then maybe u can grab some crazy glue and glue it back to the surface trying to get it as close as possible to the lines.
man that sucks i feek horrible for u now.