The L Word

Me and my SO have been together for about a week. We've been dating for a month and made it official last Saturday. He tells me everyday that he loves me, I'm the love of his life, and so on. I haven't said it back yet and he's totally ok with that and doesn't care. He just wants me to know how he feels. I feel like I love him too but I'm afraid to say it because we're still in the cupcake faze. I worry he's confusing infatuation with love and if I say I know I will mean it and when the cupcake faze is over I don't know if he'll still love me the same. Am I bugging or is my septic thinking legit?