How can someone comment on your breasts?

So, I exchanged phone number with this guy. Added him on Snapchat. He used to compliment me that I am beautiful. One day he said me not to feel bad. He was giving disclaimer and said that you don't have breasts. And I didn't feel bad because I don't know. Maybe I accept it.
The only question is how can someone comment randomly, even after knowing that we were not close.
And the present situation is.. he helps me a lot... In everything.. he compliments me, but not too much. He never talked like that again.
But I feel weird.. I don't know why..
How can someone comment on your breasts?
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