1992 Ford Mustang gears wont shift when I press clutch

I was driving one day and I was attempting to shift into third gear when it would not let me go into it and all of a sudden I heard a little noise like a pop and after that my clutch felt sofer and I could not shift into any gears I can start the car in first gear and it will take off this also happend to another car of mine and a guy said my flywheel bent what is your opinion