does anyone have advice on how to deal with this ive known this guy since the first year of highschool ive known this guy the longest of everyone and right now i dont even feel like he thinks im worth 5 seconds of his time
I don't know a whole lot about the situation, but I'd recommend trying to not take it personally. He may just be going through some stuff that results in him being inattentive. He may not even realise it. When I get depressed I tend to alienate people without even realising I'm doing it.
You should definitely try reaching out to him and tell him how it's affecting you. Communication is extremely important, but try to keep personal feelings like anger and sadness out of it. There's very few times in life you'll regret not saying something out of anger or sadness.
hmu in the DMs if you want bro I wont judge