Whether it's the awkwardness of ending things with a casual fling or the heartbreak of getting dumped by someone you legitimately love, it sucks.
But that pain and discomfort is on an entirely different level when your ex moves on — with your sibling.
This may lead to the brother trying to save face with If You Ever Do Anything to Hurt Her... It's Truth in Television, as most any guy with a sister can tell you.
While the title says "sister," variations of it also include mothers and other female relatives (such as cousins), and for girls this would most likely be "My is Off-Limits." This doesn't include daughters, because Overprotective Dad already covers that. This may also be a symptom of a character having a Big Brother Instinct. Also, this trope is almost indispensable for any Brother Sister Incest works, where it builds the initial Incest Subtext in story.
The entire point of having a sister or brother is that if (when) you break up with your partner, THEY BREAK UP WITH THEM TOO. Good luck to you if your sibling goes to church with your partner’s family before you do.It turns out, they went out to dinner the other night and my sister finds him “very interesting and good looking.” I told her I feel weird about them dating, and I swear if she wasn’t my sister I would have told her where to go the minute this happened.She could be “talking” to any of my exes and I would feel the same exact way I’m feeling now. Its a little complicated issue when you date your bestfriends sister. You should have a talk with him/her that you really love his/her sis and care about her. if she hates you dont dump him if you love him just tell her to grow up im going out with my bestfriends twin and she didnt like me but i told her its up to dylan(my boyfriend) and not her and now we are all friend Tbh I think it's a bad idea. Or he is just being defensive about his sister (all bro/sis becomes defensive when it comes to their sis). May be he isn't comfortable with dating his sister cz something of the past?but he is now with my sister and they are talking about having a baby and marriage.