How and why did it go so wrong for Ole?

I'm sure this has been discussed but I didn't see a thread for it, so forgive me if one already exists.

Before I start I just want to say I am not bashing Ole, I adore the man, I just cannot wrap my head around how things could go from so good to so bad in the blink of an eye. Up until after the PSG game we were absolutely flying, we were playing attacking football, scoring goals and our top players were on song. However ever since that famous night in Paris we have fallen back into a...

How and why did it go so wrong for Ole?