I think this song is about a man in a relationship with a girl who he is deeply in love with, but it's not perfection as he would like it to be, and he waivers from loving her to doubting their relationship. He wants to spend his life with her, and he thinks that it'll get better with time. He also feels that he shouldn't completely devout himself to this relationship as he doesn't want to get hurt.
I think this song is about a man in a relationship with a girl who he is deeply in love with, but it's not perfection as he would like it to be, and he waivers from loving her to doubting their relationship. He wants to spend his life with her, and he thinks that it'll get better with time. He also feels that he shouldn't completely devout himself to this relationship as he doesn't want to get hurt.