Why I am concerned with him as much as his mother?

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Every time my boy friend goes on his business trip--his job do not allow him stay in office most of the time,I am very very concerned with him then.I feel like to constantly send short messages,while if I didn't get reply from him soon,I would call him regardless whether he is working or not. I cannot help thinking that he may not be able to take care of himself outside.Oh,I know holding this kind of ideas is too stupid.He is older than me,and seems maturer in dealing with job affairs.But what I am worried about is how about his eating and sleeping.,though i think that is not big deal,he can do it well. I am crazy the moment I realized I almost become his mother now. I really want not to worry him again when he is working outside,but that doesn't help. What's wrong with me? Do you feel i am finicky person?