Heather, are you a couple right now? If so, have you talked to him to get his feelings on the subject?
It is good to know your own mind and feelings, but communication is very important in a relationship at any age.
Dumping him because he is moving and then wanting to remain friends may not fit into his plans and you might end up not having to worry about the 'friends' part. On the other hand, making a mutual decision might work out better.