The two-time world champion admitted Thursday that he felt “things were getting more and more sad” in his final months with the Italian team - and revealed he should have left the team two years earlier.
“The car was not competitive at all and things were getting more and more sad,” he told CNN. “So, probably, one or two years less was the best thing, but you know we tried to do our best and we fought until the end of every single race.
“After five years in Ferrari and being second all the time, I think it was enough for me....”
Asked if he should have departed Maranello sooner instead of enduring the continuing struggles, he said: “Probably, yes...”
“Sometimes, with Ferrari, you win or you lose depending on what the mood of the team in general, of the group in general,” he added. “It's a very big team, with some good things, some bad things, and as I said it's good to experience and to live once.
WHY HE LEFT
“I didn't want to give up and I wanted always to keep believing that it was possible and to keep the dream alive,” he said.
“Last year, I realised that with the Mercedes domination it was not possible to win in the short term for Ferrari and a new project was the best idea.
“McLaren is a risky project because they were completely new, but we are one team - we win and we lose together.”
Despite a year of problems and penalties, Alonso has managed to score points twice for McLaren but for him, the focus is more on 2016 than this season as the team build for the future.
GRID PENALTIES THIS WEEKEND
Alonso and team-mate Jenson Button will suffer more grid penalties this weekend after the team decided to fit new engines.
Honda has been working on upgraded engines to be introduced following the sport's four-week break following last month's Hungarian Grand Prix.
Honda motorsport job Yasuhisa Arai said: “Not all of our upgrades will be in place for the Belgium Grand Prix.
“Some parts will be applied for Spa and the rest during the weeks that follow. Our plan is to keep improving race-by-race for the remainder of the season.”
Struggling McLaren has been hit by repeated grid penalties this season as the team tries to improve its performance and establish its new partnership with Honda.
Button is expected to be demoted five places on the grid and Alonso 10 when their penalties are announced on Friday after consideration of McLaren's use of the complex 'tokens' system used for the introduction of new parts.
Original source: Alonso wishes he left Ferrari sooner