Okay I really need advice bc I am seriously wondering if I should stick with it or quit this marriage.?

We also have issues with him supporting me. He has a sister who I tried to get close too but she ignores me when I greet her, interrupts as if I haven't been talking to her, and speaks rudely about me to her other family even when I'm nearby. She even gets her daughters to be rude to me. But he was very reluctant to say anything to her, he just told me to accept her as she is. He doesn't support me in public either if someone is rude to me, especially if they are nice to him, but when it is vice versa I am very supportive, even if I didn't witness the offending behavior. It feels like he's thinks my feelings aren't important. :(