Do men say, "I love you," to girls platonically?

I had a guy friend/coworker say this to me last week. It was following a joke he said to me, and he said "I'm joking, love you really". He never made eye contact and struggled to keep the conversation going after. I never acknowledged it.

He's in a relationship with someone, and it's long term. I don't think he was declaring his love for me but would there be any semblance of truth behind that? Is that something guys say, even jokingly?

Do men say, "I love you," to girls platonically?
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