Do guys wonder if girls masturbate/fantasize about them?

I have a crush on a guy I'm attractive and he knows I like him. For various reasons he won't act on it. The chemistry between us is off the charts and I find myself thinking about him sexually. I'm crazy about him. I catch him checking me out and sometimes he flirts. If you knew a girl liked you would you wonder or pretty much assume she does this? I hope he knows. Lol
Do guys wonder if girls masturbate/fantasize about them?
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