The sides played out a thrilling 2-2 draw at the Etihad, with City twice going ahead but Liverpool were able to peg them back on both occasions.
It leaves City with a one-point advantage at the top of the table with seven league matches remaining and Guardiola believes his side will have to win every single one of them if they want to lift the trophy once again.
“It was a good advert for the Premier League – fantastic game, both teams trying to win,” Guardiola said.
“Unfortunately we could not win. I have the feeling that we let them leave alive from here, but Liverpool are a joy to watch. The players they have up front, how difficult they are, no doubt about that.
“I’m so incredibly proud of my team. Now both teams know seven games left, you have to win all of them or it will be over.
“It didn’t matter what happened – win, lose or draw this isn’t over. I would have said the same in defeat or victory.
“Of course it was an important massive game, but we know what we have to do.”
Both teams are in Champions League action midweek and lead after the first-legs of their quarter-final ties, though City look to have a more challenging task on their hands as they travel to face Atletico Madrid with just a narrow advantage.
Attention will then turn to Wembley and the FA Cup, as City face Liverpool next weekend in the semi-finals in what looks set to be another sensational encounter.