Do guys look at girl’s boobs out of lust only?

I met a decent guy and felt he liked me (locked eyes, asked me personal questions within limit, was caring). I liked whatever I got to know about him. He acted sincere and respectful at all times. Over dinner with common friends, I noticed him very subtly looking at my boobs. It was a very sincere glance, not creepy at all.

I have big boobs and now wondering if guys look at boobs of a girl they are probably just lusting over,

Or do they also do that for a girl they may sincerely like.

Lust only
Love interest
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Do guys look at girl’s boobs out of lust only?
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