How do I stop freaking out about this. Help please.?

So my boyfriend and I have been together for three months. I couldn't be happier =). He lives another state away, but we make it work very well. The thing is I've been cheated on alot in the past, never by my bf now that I hope to spend my whole life with but by ex's. I get nervous though every now and then and I don't want him to feel unloved and like he can do better, I don't want to be a failer again. I love this guy and I am only honest with him and he is with me, I pour my heart out to him and it's all honest stuff. What can I do to make him feel more loved and cared for even though we're 5 hours away?