Why did my co-worker not tell me where he heard it from?

I have been interning for a few months now. A lot of people don’t respect interns here in my department. I remember during my first week at my dept, this per diem guy was very reserved and firmed with me while being super nice & sucking up to only my lead who’s training me. This lead wasn’t very nice either.

The per diem co-worker never really talks or acknowledges me much when he is here. Yesterday he saw me, he had a big grin and said he heard I’m a “pro” now at my duties. I was confused where or who he heard it from. So I asked where did he heard this from. He looked at me and only continued the same line that he heard I’m a pro now. I figure he doesn’t wanna say. I felt humble and shy at such compliment. I told him I feel shy and I’m just an intern who’s still learning to be like him and everyone else here. He was super friendly which was unusual.

I really am curious where did he heard it from… was it from staff talking? A patient? Or our own director? I don’t get why he couldn’t tell me. My director did had a consult with my professor recently and told her I’ve had one of the smoothest internships here with no complaint though.
Why did my co-worker not tell me where he heard it from?
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