How do you confront a changed partner?

By 'changed', I mean he has stopped taking the time to elaborate on the things he used to mention to me. He used to be so romantic, and now the "spark" is gone.

We're both tired, and I'm sure he isn't seeing or sleeping with anyone else--but I just feel this dying down. Im getting so bored and just tired of seeing the same lame shit every fucking day. I do want to fix things, but how do I let him know without making it seem as if though I want to split?