on my mind

I'm really thinking about my BF.
He said that his doctor told him he had a lot of stress, so he should relax more.
But he told me he didn't understand what my stress was.
He has worked his job a long time same his way.
He didn't think it was stress. Because he is independent enterprise, so his working form was freedom, flexible and he can choose his work schedule.
But I'm not sure.
I am company employee. I have no idea how hard it is.
He told me he didn't think he has a lot of stress.
I think it is yes, but on the other hand, I also think it is no.
Probably I guess there are a lot of hard situation I cannot imagine.
But I also think.
I don't know anyone else who enjoy about own life as well as he does.
I just pray he will be well.