MONTE CARLO, Monaco - Jenson Button shrugged off his own disappointment and congratulated friend and rival Mark Webber after a miserable 2012 Monaco F1 GP ended for him with an early exit on Sunday.The 32-year-old Briton was forced to retire after damaging his McLaren in a collision, partly caused by his own frustration, with Finn Heikki Kovalainen's Caterham in the closing stages of the 78-lap race. He said: "If someone places their car well and has good exits - from corners -- it's very difficult. That's part of racing but it's so frustrating when you are so much faster than the car in front."It's just one of those things. It comes from a bad qualifying and being unlucky at the start. We were more prone to incidents. It was a tough afternoon but congratulations to Mark, he's a good lad and it obviously livens up the championship. I hope we'll have our day soon."OUT OF TOP 10Button's retirement brought a disappointing McLaren weekend to a miserable end. After the false dawn of being fastest in Thursday's opening free practice he fell away from the front-runnings' pace. He was unable to recover in qualifying and missed the cut to the top 10 shoot-out and then lost track position at the start, due to the first corner carnage.As a result, he found himself stuck behind Kovalainen, but failed to pass him and, in the end, struck him in one failed move that spun him out of the race.Since winning the season-opening race and finishing second in the third event in China, Button has struggled to to score points - he's managed only two from three races and has slipped to seventh in the Drivers' championship.