So even the fabulously famous aren’t immune to being “ghosted.” On a recent BBC podcast, American pop megastar Billie Eilish said she and someone she’d known for years had arranged to meet, but he didn’t show up and she “never heard from him again.” Eilish, who’s 22, said she later saw that he was dating someone. “And I was like ‘oh.’ But I didn’t know people still did that. I genuinely didn’t know people did that.” Well, they do. Anyone can be ghosted, and anyone can become a ghoster, says couples therapist Eric Hegmann. Ghosting – for the uninitiated – is suddenly, without explanation, endin…