SIL problem

So lately I noticed my sister in law blocked me on Twitter , Instagram and now Facebook. No I didn’t take it up the ass but I’m a bit hurt because I want to know what I did wrong ? My brother in law recently got back with his ex and everyone was talking bad about her but apparently I was the only one. Now that my BIL is back with his ex my SIL started talking to this girl more. It upsets me because she was engaged and broke it off so I would always invite her everywhere so she wouldn’t get depressed. Weeks after she broke the engagement she started dating her best friend who was a guy. He lives in Oklahoma and we live in Texas. I drove and dropped her off to spend a week with him and then pick her up and did that several times. She was recently here for Christmas and we played games and had a good time like I really don’t know why all of a sudden this happens. I’ve been having issues with my in laws since the beginning. I told babe about and he’s like well she’s my sister and I don’t even speak with her. He’s like don’t worry about it. I hate dealing with this because I’m always afraid they will plot lies