Long distance relationship

I need advice. My boyfriend and I are in a LDR as he is American and I'm an Aussie. We have been apart for 2 months and I thought it was hard but it's been manageable however, his afternoon he dropped the bombshell on me that it's too hard for him and he is depressed that we are apart. He basically was contemplating ending things even though he knows now that I'll be back in America in 7 weeks. I was going to surprise him but now he knows. I don't feel like I pushed him to change his mind but I told him it will work out and we have to take things as they come blah blah so he apologised and wants it to work out.
What can I do to make him feel better and reassure him that this is what I want and I want to make it work. 
Should I send him something in the mail? Or a nice text or something??