Weird loner kid in my cl...Could he be dangerous?he has no friends &I feel kinda bad for him. Should i talk?

Talk to him trust me I had a boy just like that in my cl I felt really bad for him then I talked to him and we became best friends ever since then he became more outgoing he also told me how he was suicidal and about to kill himself before I became his friend. So talk to him you don't wanna lose a clmate now do you?