Why do people often say I’m angel-like?

I’ve encountered that a lot. I guess I have quite a sweet/mellow ish personality and I’m quite “nice”. People have said I look and seem angelic, a lot of people have said that actually. I’ve had people come up to me and say “I look like an angel.” What does that even mean? I’m taking it as a compliment but what does it mean because angels just look/act like people don’t they?
Why do people often say I’m angel-like?
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