We were sitting a group and a class fellow (male) was sharing how he was harassed. Nobody had the urge to talk it out except me but i held it inside of me. Is it religiously okay for me to confront him via email and give him advice on how to cope with his mental health and harassment?

He is a Christian.

Yes, you can, as long as it is an advice, If you believe that it will have an effect on him.