Gale, I'm just finally getting around to reading this thread, and since it's already 3 pages long, I'm just skimming after your first post.
Anyway, getting over an ex is tough. Most people I've known just need to cut off contact for a while to be able to move on. It can be really difficult to find the will power to do that, especially when it's not just the guy you're missing, but the security of a close-knit family.
As for the guy you're dating now, as long as you've told him you're not ready for a relationship, then it's his choice to stay or go. Dating is good, especially at your age, and even if he's just the rebound guy. Yeah, you know the saying, if you fall off the horse, you have to get right back on it. And, hey, it's summertime now, and you'll be chased off to find a summer job, so who knows, maybe you'll get a little summer romance going with a coworker on that job.