To me this song is a couple that has an unstable relationship, it has it's up and downs. He is madly in love with her and believes that nobody loves her the way he does. "backbeat the word is on the street that the fire in your heart is out" word is going around, and he believes, that her love for him is weakening. He has trouble explaining how much she means to him, but he's so in love with her. Being with her makes everything alright to him, she's there to catch him when he falls, she's his "wonderwall".
"and all the roads we have to walk are winding, and all the lights that light the way are blinding" as long as they are together, there will be problems, the road in life they will walk will be hard. There will be good times and bad, but throughout it all he will love her.