On a night of heartbreak at the Santiago Bernabeu, Real Madrid’s Champions League reign came to a halt, and with it, perhaps, the final chapter of Carlo Ancelotti’s storied European run with the club. A stoppage-time goal from Gabriel Martinelli sealed a 2-1 win for Arsenal and sent Madrid tumbling out of the quarterfinals with a humbling 5-1 aggregate defeat. The scoreline stung, but it was Ancelotti’s somber tone after the match that left the Bernabeu faithful uneasy. “I don’t know,” the Italian said when asked if this was his last Champions League night with Madrid. “It could be tomorrow, in a month, or in a year. The day I leave, I will only say thank you to this club.” Story continues below this ad Despite being under contract until 2026, Ancelotti admitted the decision may not be in his hands. With growing scrutiny over his side’s stuttering season, which includes two defeats to Barcelona, the air around the Madrid dugout is heavy with uncertainty.The club is still in the hunt for the LaLiga title …