After I did Partition on my windows, I lost my mac os on booting option

Hello everyone i need help,
I installed windows 8 perfectly on my macbook pro (mid 2012)
Then I restart my mac, and try to press option, I still see the mac os option
But after I partition my disk (the bootcamp disk) i seen 3 accessible disk in my computer
Because i dont like it, i try to delete the partition letter,( I did not formated it!)
After that I want to get back to my mac os, but after i restarted my mac, i cant find my mac os in option
I still can see the partition for apple in disk management, but it doesn't show in startup
Please help, thanks for ur reply
Sorry if my English is bad

You can't partition a Boot Camp partition. Nor can you add a third partition to a disk containing a Boot Camp partition. If this is what you did you have messed up your hard drive configuration. You will have to erase your drive, format your drive, reinstall OSX, then run Boot Camp Assistant to create a new Boot Camp partition, then install Windows.

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