I would be careful diagnosing other people with "potential" mental health concern or illness. I agree with the other poster that it could be offensive. You can address certain behavior like state "I feel hurt when you do XYZ and can you please stop doing XYZ". Address his behavior whatever is that he is doing but unless you are a doctor I would not be diagnosing him or pushing for treatment. And some of it could a perception. Something you see as a problem. What exact behaviors are concerned with?

I agree with others about seeking your own therapy.

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