Is it normal that
I'm married with my husband recently but we have this kind of issue that never had an ending. When we first started seeing each other I noticed some strange things going on between my husband and his sister. My husband is 17 years old and his sister is 15 years old that time when I knew that they're sleeping together in the same bed. I ignored it although I felt jealous about it. But then I started to see how close they are to each other. I even caught him mezmerized by his sister. We started to argue about it. And I really don't understand why he is so mad about me getting jealous to his sister. He even broke up with me few times whenever I get paranoid about his sister. I really don't know what to do. He said they are just super close. But I tend to think that there's something happening between them. Please help me.