It’s hard to know what’s a good way, if he’s obsessive it could be tough to get rid of him. I had that situation and he bothered me – then my friends and family. So talk to people and let them know (if they don’t already) that he’s been a problem and you’re breaking up with him. We actually had to report my to the police for some of the things he did. So do what you must and make sure to be prepared for a hard time, obsessions don’t always end easily. Good luck, you’re probably doing the right thing by following your instincts.
Perhaps part of the reason he’s become obsessive with you is because he knows you’re a good catch and that he is lacking in many areas. If he’s 22, I’m assuming you’re around the same age, which means you are still young. Don’t settle for less than you’re worth. If he’s really obsessive, I wouldn’t meet with him in person to break up. When you return home, call him on the phone and tell him that while you were away, you had a chance to do some soul searching and the relationship is not something you want to move forward with in 2008. Once you finish this “brief” conversation with him, do not take any more of his calls. If you do, you will give him false hopes in believing that there’s still a chance. Good luck.