My best friend is mad at me for being with my boyfriend?

I'm not really sure what to do...

I've had boyfriends in the past, but last month I got a new boyfriend and he is absolutely everything. We are so perfect together, and I've been spending almost every day with him.

Lately (the past 6 months), my best friend and i haven't been hanging out or seeing each other much, and now she's mad at me because i've been spending too much time with my boyfriend.

My boyfriend is suicidal, and he has abusive parents and a lot of trouble with bullyiing at school. He smokes a lot to get rid of the pain, but it doesn't really do much. He says im the only thing keeping him alive. Im scared if i start hanging out with him less, he's going to be even more upset.

I want to keep seeing him everyday, and i explained to my best friend that he needs me but she doesn't listen. She says im "ruining her life by saving his"

I can't talk to him about it, because then he'll tell me to stop seeing him and tell me to hang out with my friend, but then he'll get really upset and possibly mad at me because i've started a fight with my friend because of him.

What should i do that would make my best friends realize i have to see him, and how should i tell him about the fight without him getting mad?

Thanks! :)