You should man-up and tell him your interest is in guys, not girls.
If he thinks you're straight, it's deception carrying on with him, getting him high, hanging out in the hot tub, etc. without him knowing you're gay.
It's 2024. Playing games, being coy and beating around the bush is creepy. If you're gay, you're gay. Pretending is cowardly and unfair to him. He should know the truth.
THEN he can decide whether to continue to hang out as bro's or even tell you he thinks you're cool. And sexy And Interesting.
Or not.