Do you think he is interested?

I spent a week with a guy whilst he was on holidays recently. In between his next visit we txted one another frequently and spoke a couple of times. We spent another night together. That was three weeks ago and since he left again we have exchanged over 40 texts and have spoken 5 or so times. He texts every day, calls when he says he is going to and has been very attentive. He lives about 20 hours from where I live. I am seeing him in 2 weeks time.. Where do you think this is able to go from here.. I dont want to ask him for anything definite.. but how do I approach the future? I think about him all the time.