Boyfriend advice needed!

Ok so I started going out with my best friend/crush on Saturday after like 2 years of a really close friendship. Saturday was an amazing day i had with him and I went to bed happy as can be but on Sunday and now today he’s kinda ignoring my Snapchats and at school he was a bit awkward with me and we didn’t talk a lot. Is this just a stage I need to get through because it’s just the beginning? I wouldn’t have thought it to have started out like this considering we are so close! What do you think? I know he has those days where he’s moody and doesn’t want to talk and normally I just leave him be and everything is fine again but idk what to do :/ shall I leave him to it and let him just naturally talk or what. Unfortunately he behaves in a different way when he’s high and he’s uncontrollable - prime example: today he came in high as fuck and was touching girls asses and hugging loads and I just feel so shit