Hi,
That means that:
1. he does not care for you anymore.
2. he does not like to spend time and hang out with you anymore.
3. that he does not like to call and e-mail you like he did before.
4. that he does not like to be physically intimate with you anymore.
5. that he wants to be left alone.
6. that he does not plan to spend his life with you.
Anyway, when this happens, you just have to accept it because he already thought that you both are not compatible. It is better to find someone who will really care and love you as you are forever.
Cheer up, I know it is not easy when this happens, life does not always work out the way we want it to be and we don't always get what we want. That is the reality of life.
Take care.