Dating someone over the internet?

[мα∂∂ιє]

Hi. I'm 15 and I have a role play twitter account. I met this guy on it and we have a lot in common. He asked me to be his girlfriend and I said yes. We always talk to each other over twitter every single day. Is this weird? I mean, I know what he looks like and everything. And I know all about internet safety, we don't plan on meeting in person. But we really like each other a lot. I know we're never going to see each other and person but I'm young and just having fun, you know? Do you think I should break up with him?
It's not meaningless to me, but we both know we're not going to meet ever. But we really love each other and have a lot in common. I'm just not thinking about marrying him or anything! Remember, I'm only 15.