Sister is Trouble

I really love my boyfriend because he has proven that he's interested in me with many things, like calling everyday, not standing me up, and making changes like opening himself -he didn't even talk. But, there's one thing that has kept me with no peace; his relationship with his sister. We have been together for one year and two months; one time, we went camping with both his sisters and his cousins. I didn't know they had such a close relationship. Actually, more close than what I would have liked. She acted like she was competing with me all the time and kept spoiling him and cuddling with him and keeping her distance with me. Argh! But, what made me even nauseous is that when I told my boyfriend that I didn't like how she behaved, he told me I was insulting them and that if I didn't like her, I should work on that. I couldn't believe what I was hearing! I didn't want him to hate her, just to support me with some comfort and tenderness about my jealousy. But then, he kept justifying his sister and, worst of all, when we argue, he just reacts and gets mad at me. I am afraid of him. I have even lost my health. He is now sorry for what he's done, but he can't give me an answer for his actions. What should I do?

— Joan, 24

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