Lily Allen implies David Harbour is a “sex addict” who cheated on her in her bombshell new “West End Girl” album.

The Grammy nominee’s 14-track record, out Friday, features scathing lyrics, seemingly describing the breakdown of her and the actor’s marriage .

While she doesn’t directly name-drop the “Stranger Things” star, Allen sings about a relationship being “open” when her partner “went astray” on the track “Dallas Major.”

She accuses her partner of having a “double life” in “P–sy Palace,” reflecting on the time she discovered a stash of adult toys, lube and “hundreds” of condoms.

In “4chan Stan,” Allen seemingly exposes Harbour for a receipt she found for a designer purse from Bergdorf Goodman.

“You took someone shopping there in May 24,” she sings. “You bought her a handbag, it

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