My brother has been with his girlfriend for almost five years, and they broke up this week. I feel stupid, because it's not my relationship, but I'm upset over it. She lived with him and my parents for almost four years of that time, and worked for our family business, so we all saw her constantly. She's the only SO of my siblings who I have ever truly considered to be family, she's like another sister to me and my sisters.
The breakup is both of their faults. There wasn't any infidelity on either of their parts or anything that extreme....they were just kind of moving in different directions and she was frustrated over it so she wanted to take a break. He said no break, they're either together or not, and she left. Basically, a lot of resentment was building up over time.
Here's my issue...my sisters and I are hesitant about maintaining a relationship with her, as my brother is pretty devastated about the whole thing. She will still be working for our family business (and so does my brother)so she'll still be around quite a bit. We don't want to hurt my brother's feelings, but she is still going to be a part of our lives in some way. Have any of you ever had a relationship with a sibling's SO that you were able to maintain post break-up, without hurting your sibling?

Re: Siblings' SOs Post Break-up