what do i do if my crush is in a toxic relationship

so i (f16) am in love with this boy(m15) called n and i found out that n is in a toxic relationship with this girl c (f14) who is like super controlling and keeps threatening to hurt herself if he breaks up with her. shes also a junkie and lives with her grandparents because her father is an alcoholic and her mom lives far away. i can’t really talk to him about this because hes not in my class and he blocked me right after c called me on his phone. i love him so much but i don’t know how he could possibly escape this relationship because theyve been together since january 2024