Why hasn't he asked for my number?

I've had a few interactions with this guy who I met through a mutual friend and it has always been positive. He's showing me all the signs that he's interested. He's very flirtatious and playful and always finds an excuse to touch me. Our banter is cute and witty. There definitely is a physical attraction! BUT he still hasn't asked me out on a date or even gotten my phone number!

I kinda wish he would stop flirting if he wasn't going to take it any further. Any idea why he isn't asking but showing ALL the signs that he likes me?

And... I'm not the type of girl that feels comfortable asking HIM for his phone number. So that's not an option!
Why hasn't he asked for my number?
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