The Uruguayan found himself clean through on goal in the final minute of the game, and could have squared to Sterling for an easy tap in.
However, Suarez opted to go alone and complete his hat trick – claiming his 28th Premier League goal of the season.
The strike meant Suarez has now equalled Robbie Fowler’s record of 28 Premier League goals in a season for Liverpool, but the 27-year-old still felt the need to apologise to Sterling.
“Maybe I could have tried for the pass to Raheem for the last goal,” Suarez said.
“But I went for the hat-trick for my confidence, I apologised to Raheem.
“I am so happy with the match ball. I feel very good because Liverpool won the game. We are so happy with the performance today.
“It was an unbelievable match. It was like the result against Stoke City away from home, when it was 5-3.
“It’s difficult when you score and then Cardiff score at the other end, but we played very well today and we’ll keep going for next week.”