If you like this guy a lot, I'd think you would be willing to spend more time with him. I can understand your need of time for the different aspects of your life, but if you want this guy to become a part of your life then you need to give him the opportunity to get through his uncertainity.
I think that a little increase in the time spent together will help matters, but you also need to explain how you feel about his time demands. I think that if you discuss it with him in a non accusing manner (ie calling him a leech), he shouldn't be too opposed to it. I think that his likely respons will be something to effect of "Well it's just that I love spending time with you and so want to do so as much as possible." However in the end he'll realize that you are the perfect type of girlfriend, one who is willing to let him have time with other people that are important to him. If you decide that he isn't for you...just give me a p-m 'cause I'll let you have your space
