Carmelo Anthony arrived in the city in 2011 as one of the NBA’s most promising young stars — a top scorer from Denver thought to be just what the Knicks needed to revive their struggling franchise.

His personal life was soaring, too.

Less than a year before the trade, he married his longtime girlfriend, former MTV VJ La La Anthony, during a star-studded ceremony at Cipriani’s on 42nd Street.

But Melo’s professional run in the Big Apple has hardly been the slam dunk he — and Knicks fans — hoped it would be.

The team hasn’t won a single playoff series since 2013, leading Knicks President Phil Jackson to publicly declare Friday that Anthony “would be better off somewhere else.”

Then there’s the off-court drama — it surfaced Monday that Melo and his wife were splitting.

Sources told The Post that La La had actually moved out of the family’s Manhattan home several months ago, saying the fading basketball superstar has been cheating on his wife throughout their seven-year marriage.

“Melo’s tagline was, ‘She’s married, I’m not.’ That’s how he would justify it,” a source told The Post.

The Web site TMZ even reported that a dancer at a New York gentleman’s club is pregnant with Melo’s child. While Anthony’s rep declined to comment, a source insisted to The Post that Carmelo didn’t get any dancer pregnant. Either way, the couple’s relationship — like the Knicks’ performance on the court — has hit the skids.

And while the two have broken up and gotten back together in the past, sources said it’s unclear if they can pull off another reconciliation this time around.

When Melo and La La met in 2003, the Brooklyn-born lovebirds were both ambitious up-and-comers who had found success at an early age.

At Syracuse University, Anthony led his team to a national championship as a freshman, earning honors as the NCAA tournament’s most outstanding player.