"We can’t work it out either," said the in-form playmaker. "We tried, we gave everything we had, we came back twice after two big knocks that weren’t really necessary and then when you see the fourth goal, that was another huge knock mentally for us with only 10 minutes left."
Christian was outstanding and created both goals as we came from behind twice at Wembley, a low cross headed home by Harry Kane to make it 1-1 on 18 minutes then a wonderful delivery conveted by Dele Alli for 2-2 six minutes into the second half.
We couldn't capitalise on being on top though and Eden Hazard rifled home Chelsea's third on 75 minutes before Nemanja Matic hit a 35-yarder into the corner to seal it for the Blues.
"We had chances but we let them back in the game and let them have the
lead too often," added Christian. "If we’d scored first maybe it would have been our game.
"The feeling in the squad is that we should have won today. If you look at the score maybe it looks like an easy win at 4-2 but if you watch the game you could see we had the advantage and should have won. They were clinical and had a bit of luck."
We make a quick return to Premier League action at Palace on Wednesday night and with six matches remaining, we're four points behind leaders Chelsea, who face Southampton on Tuesday.
Will this setback drive us on? "Yes, 100 per cent," said Christian. "If you play as we well as we did, we can take a lot from the game.
"It’s a big disappointment because everyone wanted to be in the final and have a shot at a trophy, but we still have games left in the Premier League and hopefully it will be an exciting end to the season."