Wow, I've been in this same situation before (just not so many years apart).
My boyfriend of 4.5 years and I broke up over 2 years ago. Of course I was devastated but I met someone else. We've been dating for 2 years now and I'm happy to be w/ him and in love w/ him!
I think like a year ago, my ex emailed me saying that he was still in love w/ me and always regretted us breaking up. At that point, I could careless about him so I just told him that. I think I pretty much said, "I'm sorry that you're not happy but that's not my problem anymore."
Your ex is only emailing you to make himself feel better and that is wrong. You just need to tell him that you're happy, you're sorry that he's not (even though you're probably not), and that's about it. He needs to leave you alone... don't be scared to tell him either!
