Why do girls show interest from afar, but never approach me?

So I workout every single day, so I have a really good body now. I’m like slim but with really defined muscles everywhere. All that hard work payed off. Since then, I get girls flirting with me at the gym all the time now. Even today, I had three of them follow me around. But not one of them approached me and asked me out. And obviously they were into me if they were literally following me around the gym and giggling whenever I looked back at them. I mean if they really wanted me, why don’t they at least talk to me, I’m a human being too. Two of them were hot too, but I would’ve still said “yes” to any of them.
Why do girls show interest from afar, but never approach me?
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