Marjan, I personally think that he is not ready for real deep committed relationship with you yet. He came back perhaps for comfort,security or even sexual needs, I don't know.

If I were you, I would try and get involve with other groups and activities and keep meeting other people and have a life of your own beside seeing him. I think keeping the relationship as just mutual but close friends is a good way to go. That way you both have less expectation of each other and would avoid each other.

Don't lose hope in getting close to another human being, there are lots of good ones around. Give yourself time but what is important is to live a life that you love now.

Wish you the best