Hard to say without knowing him better -- does he usually get excited over the details of party planning? Or is he the type to sit back and let you sweat the small stuff while he drinks beer and belches?..
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A lack of interest in wedding planning isn't necessarily an indication of a lack of interest in the marriage. To a lot of people -- men and women alike -- that kind of intricate preparation would be mind-numbing at best and overwhelmingly horrid at worst. And if you have jumped in and taken charge, he's probably feeling as though his help would be superfluous. Think of it this way: he trusts you completely to orchestrate the most important day of your lives. Isn't that exciting?..

Here's a test ... ..
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Go to the bakery ask for two slices of possible wedding cakes.....
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Head to him, when he opens the door, direct him to the sofa, straddle him naked, with one cake in each hand, ask him to choose ... ..
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if he knocks you off, takes them to the table puts a napkin around his neck, picks up a fork and tries each one then u'll know, he's into the details..
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... on the other hand if he's a normal guy ... ..
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he'll look at you (well ur naked body), then up at ur face (to see if ur serious) ... then he'll look at each hand ... then back to you ... (all in a fraction of a second) ... he lean to one cake take a bite ... swallow ... nibble on you on his way over to the other hand ... take a bite ... then back to his favorite dessert (you) ... and look up at u and say ... both are good whichever one u like is good with me... ..
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Don't be surprised if his next thought leads you to having cake on each boobie ... cuz he's nothing if not efficient (giggles)..

My eldest brother planned his entire wedding -- because he's used to planning conferences for work. And details about the cake didn't really matter to his wife. She cared more about the prayers during the ceremony...
Some guys don't care about the details. But he did ask you to marry him. It's your wedding, it's your day. Pick what you want. But you should ask him if he still wants to get married (before you bother planning everything and putting down deposits that can't get taken back.) People so rarely leave people at the alter these days. I'm betting he still wants to marry you. But it bothers me that you're wondering if he's ready to bolt...