"I am really disappointed with the result and the way we conceded the goals and the timing of it. It's decision-making. It happens. It will happen again for sure, but when it happens against this type of opposition, you get punished.
"We had to sustain that level for longer periods against a very, very physical team like Chelsea. We have to move on."
Arsenal were impressive in the first period, but the Gunners' intensity noticeably dropped towards the end of the game, which contributed to Chelsea's success on the break.
And Arteta said his side had to improve their shape in matches if they were to start winning games.
"It was the structure that we need to control those type of situations. And then we just stepped back, and they are really good in transition," he said, referring to Abraham's winner.