Don't feel bad. It took me a good four or five days to get over the lonely funk I hit when I started my Colorado Trail through-hike a couple of weeks ago. I'd spent a week with my girlfriend touring the Yellowstone and Teton area (also to help me get acclimated), and when I started hiking, especially with the discomfort of the heat, I just kept thinking life would be so much better with her around. I've managed to work through it and I'm having a great trip now, but this was a new sensation for me with nearly 4000 miles of solo trekking. I totally understand what what you mean by "this phase in life".