I have been "going out" with this girl almost two months. When we first started we would hang out about two or three times a week. Things started out at a decent pace and soon we were ready to have sex. However, she went on vacation for a week before we got the chance. When she returned we have both been so busy that we have only been able to see each other once a week. Consequently, things have been a little strained between us. Our dates have not quite had the same intimacy as we initially had and the prospect of sex seems to be off of the table for the moment. I have never had a thing with a girl for this long before and I'm not sure whether this is just a minor incident or the end of our fling together.
How can I re-ignite her interest in me?