I am sort of with GingerV on this one faerysflower, You know basically guys don't know what they want. However they do know what they crave.
The thing is you have to have what I call a conversational relationship where you see "eye-to-eye" on core values. Ask yourself is this...could this be my bestfriend or is he just a really good boyfriend?
Simply "speaking in tounges" together and having a chemical understanding is not going to do it in the long haul.
Be the person who you want to be. Try not to change yourself for this guy to simply accomodate your need to be wanted. Otherwise the pain you feel will be double and the selfdoubt will deepen.
To give your guy some slack is one thing, to be used to fill his need for affection is another.

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Sex is a tricky thing best left to professionals.