I had a weird sex dream with someone not my BF

ok so i had a sex dream last night with a not so attractive man in his 40s that i saw at cvs like 2 weeks ago!! I'm 18, I know this sounds stupid lol but yeah i did and i have no attraction to him at all whatsoever 
I told my boyfriend this morning and he just read and didnt reply, assuming hes mad at me for it
is this ok? what might he be thinking? i didnt do anything wrong, you know? but idk how to approach the situation if it turns out that he IS mad

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