City, needing to win to wrap up the English top-flight title with more games to spare than any other side in history, seemed to be coasting to the landmark, leading their neighbours 2-0 at the break with goals from Vincent Kompany and Ilkay Gundogan.
He added: "Today United didn't have one shot on target in the first half and in the second half they arrived twice and scored two goals".
Commenting on the outcome of the game, Guardiola praised his side for their performance but lamented some calls that went against his side.
"It's hard for our mood not winning against United", he said. And Guardiola admitted the way his side are built to play on the front foot could leave them exposed to an away goal that will nearly certainly seal Liverpool's place in the last four. It is what it is. Our team is built to create and attack, that's why we made the decisions we did to go forward.
They missed a host of first-half chances, had an obvious penalty turned down, were denied by the brilliance of United keeper David de Gea and finally saw the profligate Raheem Sterling hit the post from point-blank range.
"If that's so I will have recognise that I'm not good enough or that with the way we want to play we're not able to do that". The schedule is like this, that's why this competition is so tough. The weather is very complicated, but from the beginning of the game we knew that they would be pressing strongly.
Pep Guardiola, meanwhile believes his team are capable of turning around the deficit and says he will convince his players they can fight back in the tie. "Except 10-15 minutes in the first half when we lost a bit of control. from my point of view, we did really well", he said. "We're a little sad, of course, for our fans, our people, our players and especially to arrive in a good mood on Tuesday [Champions League quarter-final, second leg against Liverpool]".
Meanwhile, United are unbeaten in their last two visits to the Etihad, and are now enjoying a four game winning run in the league.
Back then, the former Barcelona player and coach warned that Spanish team "will be back and prove you wrong". As far as intention no complaints.
"Did we play bad?"
Manchester City must wait to annex the Premier League title after an fantastic Paul Pogba-inspired fightback from two goals down saw their biggest rivals Manchester United earn a famous 3-2 win to ruin the Etihad Stadium's dream party on Saturday. Click any of these buttons below!