Help! Is he mentally ill?

Hi, my boyfriend had really bad night last night cause his friends get him to do all these funny drugs. He came home messed up and was sitting on couch, and spray his balls with axe and light on fire, we take him to hospital and say it was accident(they are broken). And he also has been eating broken glass and things on the floor, and it is really scary. He is using inject-able drugs, how do I fix this?