A husband and his ex girlfriend and turn to sister (feeling)"daw"

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I am married for 6month old and now we live 10,000miles far from each other. He has his ex girlfriend 2 times they are engage b4 but my husband told me that he treat his ex like a sister. Most of the week he spend 4days or so there. Coz he live in a province something like that, and every time he went to the city he stay there. He told me that he don't have any closed friend except here and he can fight that. Every time his mother questioned him! why he always go there, they ended in argument. I trust my husband, BUT mind you! i am very jealous every time he is in the city and stay at his "sister". and i noticed that when he is home and we are chatting on YM the sister call him and asked if he can go down to the city because of this and that. I saw his face that he is very happy talking to her. And he told me that he is like his sister and he don't have any friend and they know each other for 20years or more than that. If you are in my situation what you think? what you feel? YOU are NOT jealous? Note: he don't have closed friends. and i am 10,000miles away from him.