Can anyone help me with my stress problem?

I have been really stressed out lately. i just joined a new religion. Not a cult but an actually religion. i really like this guy that has been constantly flirting with me and also practically cheating on his current girl friend with me. i told him enough is enough but its hard to stay away when i feel i might love him and he's also one of my best friends. i don't feel that my friends are my real friends, like it feels like behind my back they calling me a Hore or something. i haven't caught them but it still feels like they are. Also one of my very good friends is addicted to drugs, weed and ex. and he means alot to me so its putting a tole on me. im 13 and just at this age its hard for everyone i know. does anyone know anything that could help me lift same of this stress of my back. i have tried hobbies but they just don't work for me. and can you help me with my friend that's addicted to drugs? He really does have a problem i have tried to talk to him a serious sit down conversation but he usurers me he's not addicted and that its not a problem but i know it is. please help me