What do u think Guardiola meant here?

At the official website an interview quote "“it’s normal for people to have faith in us now. We’ve done well for a long, long, long time, and you don’t know how hard that is ... the players must put in the effort to continue. They will regret it if they don’t. It happened to me. We cannot give up yet,” said the manager."

He said it happened to me, do u think he meant he didnt give it all at times when he was a player? Hence he really does not want to make the same mistakes again now?

It's possible. Remember, he didn't leave the club in the best of terms.

I think he was referring to back when he was a player as well.

I think its interesting... that would mean why he is so motivated now to do well with the existing team

khaled can confirm this but as far as I know Pep hasn't renewed his contract yet which expires this summer. It is now more than 50% likely that this is his last season with us.

Huh, just becos we dont win the league?

^ Well In he has set the bar pretty high for himself. I would not be surprised if he left( he would be leaving on a high). The only thing I would worry about is a good replacement for him....