Most Helpful Guy
what caligirl2003 said down below - follow your heart. Seriously.
While all these people make reasonable suggestions to just "move on" and do nothing, how satisfying is that? When has doing nothing got you anything? If you want something or want to express something important, then you should do it. Never suppress something so strong inside you (assuming it's unharmful, of course!).
I recently have been in a similar situation and I basically ignored the majority of the advice given to me and just followed my heart and had a nice long convo with my ex. And I feel MUCH better about it. MUCH better. And you know what? Nothing bad happened, I learned a lot, expressed a lot, grew a little bit, still keep in touch with my ex, etc.
It's very therapeutic, even if it doesn't yield the results you want.
If you DO contact him, all I can suggest is try to sound as level-headed as possible, or at least don't show any resentment or desperation. Cry over the phone, sure, but don't beg or anything. Say you love him, yeah, but also say you understand and respect his perspective. etc etc.
That's all I can suggest - follow your heart, do what you think is best for you. But don't come off as insensitive and desperate.