Am I wrong for not feeling sorry for her?

So this is a pretty long story. I’m not even really sure where to start, but I guess I’ll start at the very beginning.

About 5 years ago a new girl named Katie started at my job and we hit it off from the start and hung out a lot outside of work. She was homeschooled and really wanted the prom experience of public school, so I told my little brother (Chris) that he should ask her to his prom. He did and they actually started dating for a little while, but it didnt work out for them.

Well me and Katie stayed friends and have been really close. She’s my best friend and the closest thing I’ve ever had to a sister. She has been a part of my family for years now. She has a great relationship with my mom and looks up to her like she was her own mother. Of course we’ve tried to avoid getting her and Chris together because it’s just a little awkward, but there has been times they ended up running into each other and the a civil with each other. Well Chris has been dating a girl named Allie for about 3 years now and she is very upset that Katie is a part of mine and my families life. We’ve really tried to be accommodating to her by not inviting Katie to things her and Chris are coming too. But she’s still so upset that we have a relationship with Katie.

Well recently another one of my brothers, Cody, has been dating Katie. Yes, it’s weird but its been years since Chris and Katie dated and it wasn’t serious between them. Cody even talked to Chris before he asked Katie out and Chris said he was fine with it. So cody and Katie have been getting pretty serious and asked her to go on our family vacation next month. Now Allie is super pissed and is refusing to go on vacation.

I understand that it’s an awkward situation but I’ve really lost the little sympathy i had for Allie about the situation. She is just unreasonable about it all. She claims my mom likes Katie more than her, but my mom has has a relationship with Katie for years longer and Allie never tries to build a relationship with us either. I work in a grocery store and anytime Chris and Allie are in the store I go talk to them but Allie won’t even talk to me. Same thing when she’s at our family dinner or anything, she won’t put in any effort to build a relationship with us, but claims we dont like her. Which is not true, she just won’t let us get to know her. I feel like she is just trying to cause drama all the time.

And honestly I’m to the point that I don’t care if she’s mad about the Katie situation. From now on my best friend with always be invited to my parties and gatherings and if Allie doesn’t like that she doesn’t have to come. Is it wrong for me to feel this way?

I mean I’m in the same situation with my husbands ex pretty much. She is friends with my husbands sister and I don’t care. I’m not jealous of her at all, my husband has chosen me. I’m fine with him going to his sisters house when she’s going to be there because I trust him.

I just wish Allie would get over it and just try to deal with it. Is that wrong of me?