I know what you mean about that feeling, the flat feeling. New friendships are difficult to create. And old friendships, you at least know that there have been good time, good moments and shared memories. And here are 2 friends that could have been a given and the hope for a social life with them fell flat.
I've recently felt the flat feeling myself when an old friend moved within driving distance. I was looking forward to reconnecting. But was left feeling meh, when communicating privately, she went on and on about something in her life and I was supportive. Then when I shared a bit about what's going on with me, I was left with absolutely no response. Soooo, there goes that idea :\ you're not alone