Cydia help needed! Quick! (cydia masters only please)?

Alright so the other night my iphone un-jailbroke itsself and cydia was crashing and all my apps from cydia were crashing. And all my tweaks were removed from my settings list. But anyways i fixed that today and my apps are no longer crashing. But now i have incountered another problem, my tweaks are still gone. But it says i still have them in cydia? So i go to re install them and that did nothing. And when i look at a package it has a caution sign and it says "Files Installed To Cydia.app"

Added (1). @Saad its an iphone 4 6.1.2 and i jailbroke it with evasi0n (UNTETHERED)

First Of All your iphone can't un-jailbreak its self you have a tethered jailbreak, on a tethered jailbreak if you reboot, cydia wil keep crashing so you have to just boot from redsnow or if you have iphone 4s or iphone 3gs iphone 4 you can make it semi untethered. And then the tweaks will start working and if you have jailbroken on ios 6.1.2 using evasion and you updated to 6.1.3 and you had to re jailbreak you can downgrade to 6.1.2. Then jailbreak using evasion your cydia will never crash or as you say un-jailbreak

If Cydia is crashing upon rebooting your device; if you did it with redsn0w; hook up your iDevice and boot it into DFU mode then hit the 'boot tethered' button on redsn0w; it'll boot your device up and you'll have the functionality of Cydia again.

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