ok im gonna do my best, im no petekey expert but i know a decent amount i think!! anyone else can correct me if i make a mistake. :)
pete and mikey could have met as long ago as 2003, but there’s no record of them being friends until they toured together in 2004. pete started referencing mcr song lyrics but idk i dont think they were actually really spending much time together until 2005.
in 2005, the “sweet little dudes” gang started. i think pete started referencing him and mikey as a two-member gang called sld. he referred to it in interviews and stuff, and fan questions, and even had a shirt made with sweet little dudes on it lol. mikey also started going to fob shows i guess, and they shared clothes. (also in petes lj he mentioned “white denim jackets” on a list of things that turned him on and a white denim jacket is one of the things he shared with mikey lmao)
then summer 2005, warped tour or w/e, is called “the summer of like” by petekey shippers because they were REALLY close. many pics of them together, mikey wearing clandestine industry clothes, etc.
pete wrote some really sappy things in his lj and one of them contained a line that would eventually be used in the lyrics to bang the doldrums, which ppl think is about mikey. he also wrote something about how writing messages on your arm is the new aim away message, and there are pics of mikey on stage with “fucked “ and “easy” on his arm so uh…. yeah.
when fob was playing, pete would apparently dedicate songs to mikey.
there were fan reports about ppl seeing mikey coming off of fob’s tour bus in the morning with pete, looking tired and not wanting their pics taken lmao idk the validity of that since there’s no picture proof but /shrugs
after summer of like, things died down but there are still pics of them together in 2006, mentions of him in pete’s lj and stuff, sharing clothes etc.
AND THEN THE CHRIS THING HAPPENED. basically chris was in a band called arma angelus with pete before fob, and patrick drummed for them sometimes so he was friends with both pete and patrick since pre-fob. one of the songs on tttyg called “grenade jumper” has the line “hey chris, you were our only friend, i know it seems belated but we love you back”. anyway, chris and pete had a huge falling out in 2006 because pete apparently slept with chris’s gf and then chris called pete out on livejournal about it. then pete’s dick pics got leaked, and ppl think chris did it.
how does this relate to mikey?? well, sometime after that, pics of chris and mikey appeared on the internet. and chris said something like he found a new love, and he’d fallen for a boy who had a gf. basically, ppl think he was trying to get back at pete for sleeping with his gf by getting with mikey. once this happened, pete posted a very angry away message on aim that said something like “fuck everyone, i hate everything” or something like that.
ppl say whatever happened between pete and mikey ended in the summer of 06?? at least, i think so. pete started writing sad shit, and yeah. then infinity on high came out, and ppl say it was mostly written about mikey.
to this day though, they are still good friends and communicate on twitter and insta and stuff. pete still uses the phrase “sweet little dudes”, and they have cute little inside jokes like green tea kitkats and yeah :)
basically petekey ruined my life and i want to punch myself in the face until i lose consciousness