Thomas Tuchel has admitted that Dortmund needed to lose to bottom placed Darmstadt, losing 2-1 away.
RB Leipzig lost 3-0 to Hamburg and Dortmund were looking to keep the pressure on the top two, but failed to capitalise.
The home team deserved to beat Tuchel’s men, as they attacked Dortmund on numerous occasions.
“It was a deserved victory for them,” Tuchel acknowledged to reporters. “If we play so far below our limit, it is normal to lose the game.
“It makes sense that the team which plays to its full potential wins. We were deserved losers today.
“I never had the feeling today that we ever really got into the game.”