From memory the seatbelt on the 98 liberty is not connected to the airbag system, The system has the Drivers and Passengers front inflators plus side inflators in the seats. There is also a impact sensor on the B pillar.
As for why it's jammed it could have foreign body that fallen in the mech or is rolled up to tight and that's locked the mech. Make sure the vehicle is level and then try pulling a bit harder than normal so it will roll up tighter on the bottom reel then when you release the belt it should give you a little bit of slack that should let it unlock. failing that you could try and undo the bolt that holds the top of the belt to get some slack.
A lot of vehicle dismantlers won't sell seat belts or any part of the airbag system for safety as they could not ensure there integrity so you may need to find some one that's wrecking one on market place
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