If a guy is into one girl, or likes her then why does he still add multiple girls to his page?

So I know this guy and he apparently has his eyes for someone, but apparently he has eyes for others as well. Or lets say, he may have gotten him sum then I guess that boosts his ego up, but he'll add random girls. So I'm just confused by this behavior, because if I have my eyes set on some guy and I truly really do like him. I am not going to look at other's the same way that I do with him. I mean, I am not a guy so I'm not in this guy's head, and maybe it's just a guy's thing that some do. Any suggestions?
If a guy is into one girl, or likes her then why does he still add multiple girls to his page?
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