shopaholic, I just wanted to add a little more - I am not really mrs senisible when it comes to relationshiops ( thanks Princesspeahead ). I was just lucky, I guess, that meeting up with my old flames didn't lead on to anything else. But I think it also helped that I have been on the receiving end of a steady boyfriend's unfaithfullness - with my blessing, he met up with a serious ex to sort out some possessions. He ended up having an affair with her. It hurt me terribly at the time. But - and here's the point I want to make - it didn't work out. They didn't stay together and I took my boyfriend back.
I have seen the same thing happening to other friends - they meet up with old exes and if there is an affair, it does not lead to new a permanent relationship. I know there are exceptions but I have never seen them.
I am under no illusions when I see my two old flames - I know they will never leave their partners because of me, even if life is not all roses for them. And I would never leave my partner for them.
If you feel you can meet your ex, knowing that he will never leave his wife, then go for it. If this is really not possible for you, then don't - you run a big risk of getting hurt.
If you have been emailing each other for only two weeks, emotions are running high. I'd delay for a while at any rate, keep emailing generally - even phone. You can then ask more about his life, his relationships, though don't expect him to tell you the truth. But if he is on the level and a decent sort of man, he might well convey he is happy with his wife and wants to see you as a friend. You can at least give him this chance.
Also, by waiting, you are giving yourself a chance get over the first flush of the email reunion. You never know, you might even end up finding his emails rather boring in a month or two.
must dash! sorry for ending quickly