Is he crushing on me or playing with me?

So i have this guy i met through mutual friends. Whenever we are with our friends he keeps flirting with me, but like almost never when we are talking alone. We have group chat on WhatsApp as well and every time one of my other guy friends complements me in the group or even make jokes about, he starts flirting with me more than the others and like right a whole paragraph in the group chat. I’m really confused cuz whenever we are talking alone, he flirts sometimes but like not as much as in the group chat! Last night I was talking with them on the phone while I was walking to the buss! I was working till midnight and he started saying ( I don’t like that you are walking alone in middle of the night, if I lived near you I would drive you every night after. I find it weird that he is very extra in the group chat but like not when it’s me and him only!
Is he crushing on me or playing with me?
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