AITA for telling my brother that he is never allowed to be around my new girlfriend?

A 19-year-old man faces a tough call: should he let his older brother meet his new girlfriend? The catch is, his brother has a history of pursuing women he knows his younger sibling likes, sparking tension and betrayal in their shared home.

The situation unfolds in a house where both brothers work and live together, alongside a coworker they once both befriended. What happens when family ties clash with personal boundaries? The story reveals a messy dynamic that’s all too relatable.

The situation kicked off when the brothers, working at the same factory, grew close to a female coworker.

Things took a turn as the brother and the coworker started dating, but another woman entered the picture.

The brother’s actions sparked betrayal when he pursued the new woman, abandoning the coworker.

This wasn’t a one-off—history repeated itself, fueling the OP’s distrust.

When the OP set a firm boundary, his brother’s reaction only deepened the rift.

The OP clarified his stance, rooted in protecting his girlfriend and addressing the rivalry.

The OP’s story highlights a sibling rivalry that’s crossed into harmful territory. His brother’s pattern of pursuing women the OP likes suggests a mix of competition and disregard for boundaries. This dynamic isn’t just about romance—it’s about respect and trust within family. The OP’s decision to shield his girlfriend reflects a practical step to avoid drama, but it also signals a deeper fracture in their relationship.

Dr. John Gottman, a renowned relationship expert, notes, “Trust is built in very small moments, and when those moments are violated, it erodes the foundation of any relationship” (The Gottman Institute, 2023). The brother’s actions—pursuing the OP’s crushes while ignoring their emotional impact—chip away at that trust. From a psychological angle, this could stem from insecurity or a need for validation, where the brother seeks to “win” to boost his ego.

On the flip side, the brother’s tears suggest he might not fully grasp the harm he’s caused or could be deflecting accountability. Society often normalizes sibling rivalry, but when it involves deliberate betrayal, it’s no longer harmless. The OP’s choice to set boundaries is a healthy response, though it risks escalating family tension.

For a solution, open communication is key. The OP could calmly explain how the pattern feels intentional and ask for accountability, perhaps with a neutral mediator like a family counselor. Moving out, as some suggested, could also reduce conflict. Ultimately, protecting his relationship while addressing the rivalry directly could help the OP maintain both his peace and his family ties.

Here’s the comments of Reddit users:

Many users rallied behind the OP, emphasizing that his boundary was a smart move to protect his relationship.

Some offered a more balanced view, urging the OP to consider the bigger picture while supporting his stance.

A few users lightened the mood, poking fun at the brother’s dramatic reaction.

The OP’s decision to keep his brother away from his girlfriend stems from a pattern of betrayal that’s hard to ignore. While his brother’s tears suggest some remorse, the lack of accountability leaves the OP’s distrust justified. Setting boundaries is a bold move, but it raises questions about healing family ties.

Should the OP confront his brother further or focus on protecting his relationship? What would you do in his shoes?