Why doesn't cydia work on my iphone 4?

I jail broke my iphone or at least i think i did. When ever I open up cydia it says Preparing Filesystem (Cydia will exit when complete) and all it does is reboot my phone and nothing happens. What's wrong with it I need answers fast!

You need to boot it up using the program you jailbroke it with. If by chance you used redsn0w then you go to extras and do "just boot"

Update your iPhone to iOS 6.1 because untether jailbreak is available. Source is the website to download jailbreak. Tether jailbreak is not good because if we switch off and then switch iPhone on the cydia will not work. In untether jailbreak it is opposite.

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