What if my ex is spinning out of control?

I spilt up with my boyfriend in january and I have started dating somone else
they are both a few years older than my but my ex has started doing drugs and is way out of control what should I do because I still care about him ?x

theres nothin you can do huny, if hes gone off the rails because you and him finished then its his fault, but just let him know you will be there for him as a friend if he needs you but be careful your new boyfriend may not approve! good luck xx

hell I laugh when my ex's mess up their life. ha ha ha