A Manhattan woman is refusing to move out of the apartment she once shared with her ex-fiance — 11 years after they broke up, according to a new lawsuit.

Lars Magnusson filed court papers against his former sweetheart Alice McCarney on Thursday, demanding she finally cough up the cash for Magnusson’s half of the Yorkville co-op that he’s been barred from even entering for years.

Magnusson — a Swedish shooting instructor who now runs an old-timey pheasant hunting estate in rural Idaho — says he and McCarney, a UK-born high-end hair colorist, bought a co-op at 345 E. 93rd St. in 2005 shortly after they got engaged.

He says he spent a year living there alone while fixing the place up, but their relationship began to fall apart and he eventually moved out in March 2006 — and she then moved in.

In 2007, they called off the engagement and McCarney agreed to buy out the Scandinavian bird enthusiast’s 50 percent interest in the one-bedroom.

But over the following 11 years, she’s failed to “secure the financing for such a purchase” or to engage with his “patient, good-faith, and ongoing efforts” to negotiate an agreement, the suit alleges.

Magnusson says he asked to be able to use the residence for six months of the year — but he’s not even allowed to drop by, because McCarney has removed his name “from the doorman’s list of persons admissible to the building,” the suit says.

And while she has been covering all the mortgage, maintenance, tax and other costs on the unit since the split, Magnusson claims that she’s asked him to reimburse her for half of those bills.

Magnusson wants a judge to force her to sell up and give him his cut. One-bedrooms in the 32-story building have recently been sold for between $567,000 and $725,000.

Reached at her swanky Upper East Side salon, Alice Hair, on Thursday, McCarney said only that she “just found out about the lawsuit and thought everything was settled,” but couldn’t comment further until she speaks with her attorney.

After the breakup, Magnusson married a graphic designer named Jennifer in 2008, according to an article on the couple in Garden & Gun magazine.

They now both run British-style hunting property Blixt & Co, where clients are forbidden from wearing camouflage and are instead expected to drape themselves in “tweeds, wools and earthen colors.”