What you're experiencing is perfectly normal - with any new relationship there's always a so-called "honeymoon period" where you go through the super-happy/hugging/kissing/etc phase and everything about it seems new and exciting. After that phase, it's natural that things cool off slightly because of a degree of familiarity about the relationship. The main thing to bear in mind, and the thing which stood out for me in your post, is that you say when he pulls up you still feel happy and excited, and by all accounts that shows you still like him and want to spend time with him as before. If you weren't feeling anything at all that would perhaps be more cause for concern, but as things stand you have nothing to worry about. As for the loss of the massive crush, bear in mind a lot of that will be generated by nerves and anxiety over whether it's mutual, whether to act on it and so on. A lot of that has gone because you're now seeing each other, so there's no need for the anxiety - as you say yourself, you have no worries about being dumped which shows you're more relaxed about the situation. So again, it's nothing to worry about.
Hope that helps and take care.
