the guy is talking about how when he was with this girl there was all sorts of things he saw differently or didn't see at all. she was the only thing that existed in his life. now, she's gone, and he's sitting back where he started and realizing there's a lot more left to discover. and while he is sad, at the same time he is hopeful about the things he's seeing now and learning about, especially in himself. he has to move on whether he likes it or not.
the guy is talking about how when he was with this girl there was all sorts of things he saw differently or didn't see at all. she was the only thing that existed in his life. now, she's gone, and he's sitting back where he started and realizing there's a lot more left to discover. and while he is sad, at the same time he is hopeful about the things he's seeing now and learning about, especially in himself. he has to move on whether he likes it or not.