I don't think you're going crazy.

Although I can't relate with what you're feeling because I have never felt any kind of connection or romantic interest towards another human, I can use logic to go out on a whim and make an educated guess to why you might be feeling the way you're feeling:

Perhaps you have been craving intimacy with somebody for a long time now and now that you finally have it, you crave more? Similar to how if you go without eating for a few days and somebody gives you a delicious meal (lets say a pizza) and you devour it but it tastes much better to you since you haven't eaten anything else prior for a few days.

That would be my guess but I am honestly not that good with the whole intimacy thing since I've never had a stable relationship in my life and I don't really have a current desire for one.

Still though since I am still online I felt obligated to at least try to help