insights pls

my bf had a girl bestfriend. long story short, we had an issue with the girl because she was secretly crushing on my boyfriend (her so-called "bestfriend") back then, one time he snatched my bf the whole day when it was her birthday and made him skip classes and I was pissed as hell. we would hang out then she'd suddenly call to hang out and secretly told other people that if i was that jealous then I should be just his bestfriend too lmao. Fast forward to 2018 my boyfriend cut her off because she was too much. Shes so clingy and wanted to feel important. 2020 we didnt hear anything from her.

My boyfriend has a little brother, a year younger than I am. Now she keeps on hanging out with him. Just a few days ago she went to visit the brother at their home and tried to ask my bf to hang out, he politely passed. And then, again tonight (it's 9:39) my bf got mad because this girl, visited again and wanted to drink with his brother. :/ I mean, it's so obvious that she'll later on asked my bf to join lmfao. Its just too pathetic, I try to be unbothered but idk, I feel like she's doing it on purpose lol