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Check for leaks first. The Flex line could have had condensation in it, and when it froze and thawed, caused it to split. When you check for leaks, have someone else press the clutch pedal in as you look, this way the hydraulic system is charged and any leaks would be more visible.

If you follow the hydraulic pipe down to the slave cylinder you can actually see it extend and retract as the pedal is depressed. There are many reasons why your clutch pedal could lose firmness.

blown master cylinder seal
blown slave cylinder seal
cracked hard line
leaking flex line
broken throw out arm (unlikely but has happened)
broken throw out bearing

Check for leaks first. Make sure that the master is getting fluid from the brake reservoir. Make sure that the throw out arm is moving when the pedal is depresed. If the arm does move when the pedal is depressed, wiggle it with your hand. If it feels like it's not connected to anything that would indicate the bearing may have come apart. Worst case would be that the pressure plate springs have desintegrated. If everything else seems to be alright, you would have to separate the tranny from the engine to insepct it.

If the slave is moving, but the clutch still will not disengage, you could have a bent clutch fork or even a broken fork pivot bolt (I actually had the pivot bolt sheer once.... very odd). I also seen the clutch fingers get bent or not move correctly b/c of poor torquing of the pressure plate bolts.

it sounds like the lines have a leak or something like said above.

when I had air in my lines it felt just the way you described.

please don't post dredge, that was almost 2 months ago

^^^