Whys he acting like this suddenly?

ok so i have this friend and he lives by my sister and i spend alot of time at her house on the weekends.(were all in highschool btw) and i like to walk alot and jus hang out outside and so on friday then i was outside and i hung out with him all day and until i had to leave that night well hes jus been acting a little bit odd if u ask me. Like he never acted like this before. and ive been friends with him for almost a yr. Ok well like i said we hung out all day and he had like grabed me and pointed his finger at my head n acted like he was gunna shoot me jp around and stuff trying to b funny and kept me like that for a few mins then when he let me go then he still had me but by my shoulders n i was still a lil off balance from b4 n he started to spin really slowly but i said that i was about to fall so he stopped n stood me upright then we started to walk a lil an he had gotten on this 1 kids skateboard n was holdin on to my shoulders as i was wlkin n stuff then later he was ridin a dirt bike and asked if i wanted to go to the gas station with him n i was like i cant id b in big trouble then when he got back he kept askin me if i wanted to go for a ride but i couldnt cuz id have gotten in huge trouble so yea n he understood then later we were walkin n his friends dad came out n said somethin updating him on his friend cuz hed been in jdc for somethin n was getting out that day so he was tellin him about his friend getting out n stuff n hes like well ill let u go i c u have ur gf with u n he didnt even try to correct him but jus acted like it was nothing and later we were walkin n it was gettting dark n we were walkin on the road past some woods n he had started to scare me tlkin bout ghosts n stuff n he wasnt stoppin so i covered my ears cuz i was really freaked out n said no plz ___ stop plz jus stop! n he wd his arm around my waist then pulled me really close n was like no its ok its ok i was jp its ok but after a min it was like he had jus realized what he did n it was like he thought he was crossing a line or somthing bcuz he let go n steped away (but was soon close again after a few steps) then the next day i went to a hh and on the way back i was txting him n i was like when i get back i wanna wlk n hes like come knock on my door ill walk with u n i jus think its kinda weiord bcuz he was cold the 1 nite but didnt go in to get a hoodie or go in at all till i had to go . and the thing that confuses me the most is that he has a gf already so can some1 plz help me bcuz he nvr acted like this b4 n its confusing me on y theres this very sudden change