friends act weird with me. what do

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>has 1 close friend and 1 "stand-in" since middleschool
>everything always had been ok with close friend
>this year, stand-in started hanging more and more with close-friend
>i got a gf
>stand-in acts weirdly possessive, wants me to dump gf because "bros be4 hos!!"
>still with gf
>hanged out with my friends less because of gf
>close-friend turned 18
>he also started to act weird when we hanged out altogether
>he does not reply to my messages anymore or try to avoid me
>stand-in's mom think i'm his dealer when i'm clearly not, can't go to his place anymore
>stand-in tells me weird stuff about closefriend, i start to believe he tries to keep closefriend for himself LOL

>>fast forward: a week ago

>hangs with stand-in
>closefriend joins us
>he barely talk to me
>stand-in tells closefriend to come to his place to kill a rat or something
>tells me to wait outside, & that closefriend would text me when he'll leave
>got back home cause i knew i wouldn'r text me and stay there, and that's exactly what happens

>>f-f: today

>stand-in calls me at 10am tell me to come over and smoke a joint cos he home alone
>get to his place, smoke a bit and leave at 11
>gf come at my place from 12am to 5pm
>text closefriend at 5pm, ask him if he want to hang out
>obv no reply
>text s-i : "n-n-nah my mom's home"
>tell him to stop his bullshit
>no reply
pretty childish stuff but i dont know what to do. i've always tried to be cool with everybody and i dont know why this happen, closefriend was actually a close friend, i was cool with all his family and shit, i don't get whats going on.

help pls :]