In the late 80s, Lionel Richie was riding high.

He had a hugely successful career with numerous hits — including the duet “Endless Love,” one of the biggest singles of all time — and a multi-platinum album in “Can’t Slow Down. He’d also co-written “We Are The World” with Michael Jackson, and it sold over 20 million copies.

However, his marriage to Brenda Harvey was on shaky ground. They had separated, although very few people knew.

In June 1988, Richie paid a visit to his girlfriend, Diane Alexander, when Harvey appeared on the doorstep. What followed was “the most awful screaming match of my life,” the 76-year-old singer remembers in his new memoir, “ Truly ” (HarperOne, out tomorrow).

Richie thought he could defuse the situation by leaving, believing Harvey would follow. She did, b

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