Well my gf has a friend she calls her "brother" here in college. Both are in the same class and have been friends before i started dating her. Well after we started dating i realised she is pretty close to him compared to her other friends and she once posted a story with him sleeping on his shoulder in class. I confronted her back then too and she reassured me she will reconsider her boundaries with him.
Cut to the present, her class is on a departmental trip right now and she sent me some photos of her, most of those were with her "brother" which is fine to me but some particular photos were of her holding his arm like couples do that i didn't like, so I sarcastically replied "nice couple" to which she said what happened and i just confronted her again about the same thing and she said she did consider and this was a decent pose for a brother sister but she anyways apologised and said she would not go near guys ingeneral.
(In general I don't like that guy, he always makes me awkward whenever he and his gang catch us hanging around, I'm a little introverted so I just try to ignore them (have talked about this with her too). He even used to tell her that he saw me in the mess in this attire like he's obsessed with me or something, basically keeping eyes on me whenever he saw me)
I was just thinking, am i being too controlling or insecure?