City have now lost their last three matches - twice against Liverpool and the defeat to Manchester United in the derby - but Guardiola said they should be proud of what they have achieved over the season with his side needing just two victories to wrap up the Premier League title.
Liverpool are through to the semi-finals after coming from behind to secure a win at the Etihad Stadium.
Mohamed Salah booked Liverpool's place in the last four for the first time in a decade when he coolly chipped home his 39th goal of the season 11 minutes into the second half before Roberto Firmino inflicted a third consecutive defeat on City for the first time in Guardiola's near two-year reign. It was a while ago Liverpool was in the semis and I was in the semis and now we are there together."Guardiola admitted beforehand that his side needed the "perfect" performance and the hosts got the ideal start as they opened the scoring after just 117 seconds".
Guardiola is also facing an improper conduct charge for communicating with his bench in the second half after he was sent off.
How Klopp countered Guardiola's plan to guide Liverpool into Champions League semis
I play for the team, I try to score each game for the team, that's the most important thing for me'. City protested strongly, arguing the ball towards Sane had come off Liverpool's James Milner .
The former Manchester City player, viewed by many as simply a squad player at the start of the season, not only delivered with his work rate and tackling but clearly added some calmness and authority to the midfield.
'But there was always a chance for us.
"I know what happened in Monaco last season, at 1-1, with an incredible penalty [not given to] Sergio Aguero".
'But we were still moaning, having little fights, that's not the attitude you should have.
"It was all positive, there was nothing negative, but I needed to remind the guys that we had 50 minutes to be in the semi-finals of the Champions League and we needed to give more". In the second half today we got hold of it slightly more but we still have to improve. It's different when Gabriel Jesus' goal at Anfield is offside.