"Saying" it would be hot and DOING it are two different things. Especially with guys, I've found.

There are a few possibilities:
(1) Got cold feet
(2) Activation energy (he doesn't have the energy to find the person
(3) It isn't his fantasy, so he figures you'll lead

Good luck; communication should fix this one.

Signed,
Fellow freak

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Life is too short not to love and be loved....preferably multiple times in one night.

I think men talk to women so they can sleep with them and women sleep with men so they can talk to them. ~ Jay McInerney