Hi and thanks for the query.Indeed, this is a difficult situation where the person suffering from a condition does not want help.
However, this is also a symptom of depression. You might have already tried to convince him to see a psychiatrist for help and failed at it. So, the next step is to go talk to a psychiatrist on his behalf and see if an appointment can be made in absentia or if the psychiatrist can send a psychologist or a helper over to convince your boy friend to come and see them.
Another way is to ask your boy friend that you need to see a psychiatrist and that he should come along for support, the psychiatrist should however, be aware before hand who the real patient is.
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Yes it is best if he agrees to see a psychiatrist.
Try to spend time with him and try to convince him to go out socialize with friends. Regular exercise or yoga would help. Chamomile tea would have soothing effect at bed time.