Many ladies often experience this but normally such a situation arises after years of dating and often after a couple has had a kid. The aversion to being touched merely implies that there is something deep down that is compelling you to feel detached.

Has something been occupying your mind lately and you are yet to deal with it? Does it feel like he doesn't care enough for you?

It's not impossible to get back the spark back into your relationship but you need first to objectively analyze your relationship and yourself, see whether there is something that you've ignored which needs to be fixed.