More understanding

Callum's been feeling a bit down over the past few days. He told me today that a few memories keep coming to light and its just difficult. To miss, to need someone that much and yet they're not there.
Perhaps it should have occured to me that he might be feeling like this.
I keep telling him off for not eating, for not sleeping at the right times. Then when I come in from parties or from town at 2/3 in the morning I expect him to be on skype to talk to me. How contridicting is that? I know he won't complain and that he wants to talk to me, but it feels like I am taking advantage of that situation.
I try to make a difference and look after him that best I can, but its difficult because I don't for one know exactly what he is feeling like, I can imagine to the best of my ability but its not the same. Also I am so far away this time. I have now four lives. One with my friends back home, Callum, my family and my Uni life. Its fantastic but at the same time hetic.
When he gets upset or angry with himself or annoyed, I feel whatever he feels. Then he gets himself even more annoyed because of the fact that I get upset because of him. Which he shouldn't.
I just don't know what to say other than I love him. It feels like its not good enough however but that's all I can do. :/ :)