Firstly, congrats on lasting so damn long your first time! I think I made it about all of five minutes..
Were you drunk? I am known to party a bit too much, and I've had that problem occur before when I was piss drunk. If you jerk off a lot that could be the problem, or you might just have some damn superman stamina! As long as you switch positions, the rhythm of your thrusting, and make sure to continue escalating your kisses and touch, I don't think any girl would mind being banged out for an hour. If she has enough time to think "wow this is taking a while, can he just cum for me now?", then I'd work on refining sexual technique, instead of worrying about the length of it.
As far as the girl, maybe invite her to a bbq with you and your friends, or to join you for a smoothie. Something that doesn't seem like you just wanna bang her again. You can always find an "excuse" to go back to your place later.
But if she doesn't respond soon, go find some new ones. No one girl is worth obsessing over.