<human>: Hey

I have this best friend, both M by the way, who used to be like my brother. We would litteraly do everything together and we were really good friends and we would go on his boat and just chill and hangout everyday during the summer.

He was the one person who I could trust with most things and relate too.

A little after 10th grade, our little "group" we had kept teasing him and making fun of him about that he was put in this somewhat resource like class, where the work is just easier. He was constantly getting picked on and j never picked on him because A) Best friend and B) stupid reason to make fun of someone for.

After that, he kind of stopped hanging out with our group and even though I preferred to hang out with him and other people, he always left after school and never stayed around. I started talking to him less and I noticed he started hanging out with other people that wernt doing the best of choices. He started doing weed, basically every single day, other stuff and we barely even talked at that point. I'm not saying me and him didnt do stuff, but he was abusing it. We talk sometimes in one of the classes we have but other then that he basically ignores me. 

It seems like he's forgotten who his best friend for so long has been and all the good memories. Just gone. This feels good to get off my chest and I do feel really bad about all this because I don't have anyone I wanna hangout with anymore and no one I can trust and chill with. He was the one person that I knew I could trust.

I really don't know what to do at this point. It's been almost half a year like this and it really sucks.

Can you give me the gist of the text in a nutshell?
<bot>: best friend was my best friend, was made fun of by friends, started hanging out with other people, doesn't really talk to me that much.