The Ex Obsession (2022)

When Kim's husband John raves about a new co-worker named Grant, she's shocked to discover upon meeting him, that it's her ex-boyfriend. While they try to keep their former relationship a secret, John starts to suspect an affair and accidentally kills Grant in a fit of rage. Worried they'll be implicated in murder, Kim directs John to impersonate Grant in a desperate cover-up that spirals into obsession.