Let there be a give and take on who initiates getting together socially. Let the time you spend together increase gradually. Show him you are interested in him by being happy to be with him, listening to him, getting to know each other, getting comfortable together.
I’m a believer of showing your best qualities and exposing your ‘flaws’, ‘baggage’, negative information more gradually once you get close. People can get scared off easily. Also, you are giddy over him right now, but as you get to really know him, you’ll see his flaws, too. This is good before you jump in too deep.
He may want to initiate sex soon. Is there still some unspoken dating rule concerning sex on the third date? I like that you want to wait for at least an exclusive relationship. So, in taking it slow, you won’t initiate sex with him right away, and if he does with you, you’ll tell him you don’t want to rush it and are looking for an exclusive, loving relationship.
If that scares him off, so be it.
But try not to scare him with talk of getting serious and exclusive too quickly. If he is letting a friendship bloom, you do the same and let that happen.