Do guys stare at boobs just in general or because they like the girl?

So this is the first time I have noticed this happen to me. I was with guy we have been friends for a few months now. But right before class we were talking. I noticed a couple of times that he was staring at my shirt. Which to be honest my shirt has nothing interesting on it. So my conclusion was he was staring at my boobs.😧 Later I realized this shirt was to tight so I dont know if that made my chest look bigger. Anyways I know most guys stare at boobs but is it just a natural habit or because you might like the girl?
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Thanks everyone for all your comments.
Do guys stare at boobs just in general or because they like the girl?
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