bluemagic, You're right about my encouraging him to play with a child even if we knew they would only be around for a year. But I think because of his LOVE of this girl, it's a bit different. I'm afraid because he's so attached to her, even without seeing her much over the summer, he may hold on to feelings of...I don't know, abandonment seems a bit over the top, but it describes how he felt about his first love from Kindergarten. He still talks about HER, too!
So, I'm really second-guessing the wisdom of continuing the relationship. I could kick myself for suggesting the pen pal thing.