help!

I got beack together with my ex after 2 years of not seeing eachother. The first time we dated, I felt like I found that "one person" that I wanted to spend the rest of my life with. Things started to become serious. But, as others, just like me, I became scared and did one of the most horrifying things I could have ever even thought of. I cheated on him. We obviously broke up and stopped talking. But now that we are back together, I feel, once again, like I found my "one and only". He tells me that he is over that whole thing, but I know he isn't. I know that he still thinks about that night and wonders "why would she do that to me?". I tell him that I love him everyday and every night. I leave him cute little messages telling him how much I love him and how much he means to me, but it's getting to the point where I don't think just saying "I love you" is doing enough. I don't want to smother him or drive him away, but I want him to know exactly how much he means to me. I need help. I don't know how to let him know how much I love him and how I think of him almost every second of the day. Please, HELP!!