You can make some great friends on the internet if you are very careful, but as far as having another type of relationship, it may be fun for awhile, but it probably won’t work long term. The reason I say this is because you are falling in love with a voice, or words on a screen, not a real person. This isn’t saying the person you are talking to isn’t real, but like Niki said, it’s kind of like having an imaginary friend.
I talked online to my present SO for close to a year before we met. We thought we knew each other because of all the things we said online and on the phone, but once we met, I was surprised at how much more I had to learn about him. People are very different when they have the anonymity of the internet to hide behind. They can tell you anything they THINK you want to hear, and hide what they don’t want you to know about them.
In some ways, it makes it even harder to get to know someone because when you meet, you have all these pre-concieved notions about what the person is like, and it strains the relationship because you have to start all over again to really get to know each other. I think it’s in your best interest to just be friends with this guy, and look for someone who is nearby. At your age, you shouldn’t tie yourself down to someone who is available to you in real life. You can’t go to the movies or out to dinner with your computer screen.
In summary, freindships can work, but love relationships are very difficult at best, and can be very dangerous.