Brother

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Been dating my girlfriend for a few months now. I've noticed one of her "close" friends in pretty influential to her, manipulative even, and not in a positive way either. She's also the ex girlfriend of one my girlfriends brothers.

In the beginning, they were just going through the breakup, so she wasn't really in the picture. Then she starts leaning on my gf for emotional support maybe? and my girl gets it in her head that she needs to help her get over her brother

Cool, alright, they were friends before so whatever. Then my girl starts spending more time with her, after work happy hours, girls nights.

I tell my girl that there's a reason her brother dumped this broad and upgraded, don't let her pull you down either. "These guys she's crushing on are only using this girl to get to her friends and eventually you" "Anon, stop being so insecure, they're not like that!"

I've told her my feelings toward this and if this sort of things continue, then I'll end it sooner than later. She's 27, so I don't need someone easily influenced by others anyway in the long term. I'm also wondering what the relationship with her brother is? He's moving away, so I wonder if my girlfriend is using his ex as a filler for the brothers less contact too..

Are my thoughts justified here?