It seems to me like this girl was the guy's loved one but she died. She keeps living in his dreams, where they're together, symbolically denoted as kissing. Though her appearance in his dreams keeps him attached and he can't let go.
In the part where she's speaking, she tells him not to be afraid of loving her, and that he should keep her love with him and move on (as in, live the life beyond the dream).
When he does that, the dreams start to fade although he still wants to dream about her, get one last kiss.
It seems to me like this girl was the guy's loved one but she died. She keeps living in his dreams, where they're together, symbolically denoted as kissing. Though her appearance in his dreams keeps him attached and he can't let go.
In the part where she's speaking, she tells him not to be afraid of loving her, and that he should keep her love with him and move on (as in, live the life beyond the dream). When he does that, the dreams start to fade although he still wants to dream about her, get one last kiss.