What did he mean when he said "I love you to death"?

There's a man I know professionally and he asked me not to make public something he told me in confidence. He said, "(my name), I love you to death, but please don't write that." Caught me by surprise. A day later, he asked me to come to his office to pick up some information. His girlfriend was there - and he introduced her to me as his girlfriend - but then made a rather large show of giving me a hug. What should I make of this
What did he mean when he said "I love you to death"?
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