LONDON – Ruben Amorim’s Manchester United honeymoon is truly over after Nottingham Forest inflicted a second straight Premier League defeat on his side on Saturday while Manchester City stumbled again.Leaders Liverpool maintained their seven-point lead at the top of the table even though their match at Everton was postponed because of storms on Merseyside.Amorim replaced the sacked Erik ten Hag at Old Trafford last month after a terrible start to the season.He began brightly, with a draw and two wins in his first three games.But reality is starting to bite hard after a 2-0 Premier…