If you ask me, it was the media, who started to question him. More and more, week after week. And it was a long stretch. They were 17th or 18th at Christmas. That wore him down. Even my dad said, a change would be better for both. But Dortmund sticked with him -- a smart and loyal move. After the winter break it suddenly worked again, almost as normal. They were the second best team in the second half of the season and moved up to the 7th spot.
But the frictions have been there. Klopp started to wonder what he did wrong. And indeed a couple of expensive signings seemed to not work. Immobile was a failure. He's now in Spain and I doubt he's a success over there. But Mkhitaryan was one of the really strange ones: He played wonderfully even in his first year, but he couldn't score to save his life. Now that Klopp is gone, he's scoring, from the same spots...
Anyway, Klopp wanted to leave because he was disappointed. But probably not so much because of the club or the fans, they never let him down. My guess is that he was disappointed by the media and by himself -- in the sense that he couldn't solve the problem earlier. A problem that noboby can solve IMO: Bad luck over a period of time.
That's a really funny post unless you know something we don't. Which top clubs actually offered him a job which he refused to take? I apparently missed all of them. Or do you expect him to sit and wait for such offers that may never come? There's too much competition in his profession to snub too many offers. Your assumptions about Klopp's reasoning for joining Liverpool are off the mark.
