My sister has cut me out

I've decided to pay mostly because I'm starting to feel depressed. I have a sister in law whom was my best friend... we have been best friends from the start. She was in a relationship with a very stupid man for a couple of years and he and I didn't get along. We always had issues. He would cheat, lie to her and even deny to his family that they were together. Long story short, they divorced. She soon ended up with a new man. I guess I started to see alot of the same patterns with this new guy too. I was very vocal about it. She started to be really upset about it and soon I stopped. I just wanted to protect her from all she went through with her ex. A mutual friend of all of ours told me that my sister in laws new fiance had been talking so much crap about me. At first I didn't want to bring it up but spoon decided I just wanted answers. I confronted him. He denied alot but apologized for some and we went on our way. Soon I started working wit the mutual friend and my sister jn law seemed distant.I asked her if she was opposed to us working together and she said she wasnt, just to be careful. Soon I was messaging her and she was completely ignoring me. Her fiance blocked me on everything and she blocked me on most social media too. After about 2 months of her ignoring me she finally told me I deserve to know why she's ignoring me but "not right now" she wasn't ready. I asked if it had to do with the friend and she said no, If it was to do with her ex she said no. I just don't understand why she is ignoring me.my husband is saying fuck her and our friends are.too but I just don't understand how I'm supposed to feel when my family, my best friend is ignoring me. My heart feels so broken...

nice reply Aunt Kitty :)