Still love my car but......

glad you got it off
be sure to send Mrbill00 a PM, that's a great offer

sounds like the bolt wasn't even all the way threaded
there is a chance you can chase the threads and have enough meat left on the bottom to put in a new bolt
if not, a helicoil, or better yet, a time-sert

sounds like now would be time to replace that chain (no pun intended)
get yourself a good double roller one and you'll never have to worry about it again