<human>: Provide a brief overview of the text.

This past weekend my boyfriend (dating almost three years) and I got into a fight. He eventually told me that he had cut his leg with some gardening tool in several places. He admitted that he self harms and has been for a long time. He also told me that he has never told anyone before and this his first attempt at really dealing with the problem. 
He believes he does it as a coping mechanism (anger, sadness) but its also become an addiction since he self injures just for the sake of it. 
I love him so much and all I want to do is help him to deal with what he's going through and just be supportive in whatever way he needs. I have done a lot of researching and tried to inform myself of how he might be feeling and what things I should say or not say. He has already agreed to see a counsellor. 
So Reddit, please give me any information that might be useful in this situation. How can I help him? What are things I should know? Am I doing the right things so far?
<bot>: My boyfriend self harms, I just found out and he is just opening himself up to the idea of dealing with it. What can I do to help?