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Get Strong Nails
Almost every girl at least removes the previous nail paint and applies fresh coat of nail polish once a week, i.e., on sundays. So, next time onwards, remove that old nail polish on saturday night and massage your nails for some time with a good moisturizing cream or some coconut or olive oil.
Leave it overnight and the next day once again massage your nails, wait for a while and then apply nail paint.
Also paint the inside of your nail tip with a clear nail polish at least once a week which may keep your nails healthy and none of your friends will be able to know if you've done it.