Most Helpful Guy
You need to CALL him. Tell him that you need to have a serious talk face to face when he comes back. You can't leave it all because you don't have a definitive answer on what he wants. This is why you guys need to sit down in a relaxing atmosphere and talk about it.
Most Helpful Girl
Yes, you need to be honest with him. Tell him that you like him, but you don't want to be screwed over.