Truck got JELOUS

[69long"n"low]

So i daily drive my 69 lwb with my wife and kid. We have a second one on the way so lately we've been looking at cars while were waiting to hear back from the bank. Well i dont think my truck liked thatcause on the way home from work yesterday all of the sudden i lost my power steering i didn't think much of it my belt was loose and the p/o solid mounted the pump, but i look down and no charging and the engine is getting hot. So pull it over pop the hood and the harmonic balancer bolt sheered at the end of the crank and the key sheered so i had a balancer and crank pulley set lying on my crossmember. Luckily we just re-decked the flat deck trailer we have at work and my boss was nice enough to come and get it to save me the big bux tow.

Sorry to go on so long I just needed to vent and get some ideas why it would sheer like that
Thanks for listening Josh