Nervous

I am starting a new relationship with this guy and we both are starting over because we both got out of crappy relationships. We knew each other years ago and I recently found out that he had a crush on me and I did on him. I'm starting to develop feelings for him but we both agreed to take things slow. I don't want to push him away to soon. I don't know what to do, I want to tell him how I feel but I don't want it to push him away. Any advice or tips?