Should I Just End This Relationship?

Posted this a couple times but need some more opinions.
Please take the time to read.
I’ll try not to go into too much detail, but the past couple of days with my girlfriend have had me thinking about whether I should let her go or not.
But let me explain the first day of when my troubles began, my girlfriend went to go see her cousin, that’s all she told me. She didn’t tell me she was going to his funeral, apparently she did not want to tell me so I would not worry about her. But her attitude made it obvious something was wrong, so that plan backfired on her. We got into some small arguments and go a bit angry with eachother, one of her friends told me that her cousin died then I just began to become very enraged that she did not tell me this. So I told her that friend told me, and she just got rid of that friend like she was nothing because she broke her trust. But to be honest if my gf is blind, she broke my trust by not telling me in the first place and preventing this from ever happening, she should have the sense to know to not keep secrets like that.
Anyway, that’s not even the worst, that’s nothing really, but it still contributes. Btw, that problem is solved and that friendship resumed.
One of her friends the next day later, just began to get a bit flirty with me, I didn’t find it comfortable. Being completely honest with my girlfriend I told her of this. And she cut off that friendship as well, not just between themselves, but she attempted to cut it off between me. In the past I tried stop her from being friends with someone, but it was not out of jealousy or nervousness, it was due to the fact that it was a 12 year old brat with no sense of respect, they later even got into a huge argument and just stopped talking. She tried to use that against me when I confronted her with this. “Oh but you can decide who my friends are.” It just made no sense, and this was clearly out of jealousy.
I dont have the right to decide who her friends are, but I do have the right to make a suggestion. But she just brutalized the friendship between this friend of hers, her reaction was not needed. She even threatened to dump me when I got a bit mouthy with her, but I told her she was lying and she just shut up.
All this drama took a toll on me, but im sure it took a toll on my gf as well. But I believe this relationship is run on fear, which is not good. Should I try and working things out? Or just withdrawing out of the relationship. I’ve been with her for about 10 months.
Thanks to all.