My question is how do you know that he is in a better place?

If he does feel better being away and you don't like it. I see it as a sign that you need to become more independent of yourself. I see it as a life lesson; yes maybe you don't see that right now. Though when you make yourself become more confident then you'll see that everybody has their own life and in every situation there are the positives.

Like so it's a waste of time to feel down because someone else is feeling happy. I would be happy to see that he is happy and to know that you are a good person yourself and know that you'll find someone else.