ok today i was out riding my mt bike on trail.

All of a sudden, chain jam, so i had to get off bike, only to find that my middle ring was broken.

like one part was totally broken away and rest was bent.
I have no clue as to why this happened.
Is it possible that when i installed it , it was not tight enough as the other bolts were all loose.

It was a newer chain ring as i installed it a few months ago with no problems.
well back in May.
it was working fine as i was riding on it quite a bit with out problems, but the odd times chain would skip here and there.

So why would this happen?
do replace? should i replace the entire crankset? or just get a new middle chain ring?

As even as i can ride in the lower ring and the big ring, but my chain still skips

i have a newer chain and the rear cogs are new as well.
just the front is a bit older
derailleurs are older shimano XT and are set fine,
so what is the suggestions?