Girls , My girlfriend is turning dominant.. Could you help me out?

My girlfriend of 3 years relationship.. Whom I used to spoil..& treat her pretty good.. doing everything she'd wish for.. even girls got jealous cause of her.. who seemed to be totally submissive to me.. having me as a leader for the relationship.. doing whatever I'd find right to do..& I'd even discuss things with her , so I can get her opinion as well & she was being happy with that..
is no longer seems to be so.. she's been turning to be dominant over me..
starting by isolating me slowly.. from others.. girls mostly... making up fights based on jealousy... every few days.. and we'd fight aggressively.. even tho I might have done nothing that worth an aggressive fight.. Girls would just get to me.. & I push them.. some may try to express thier feelings toward me.. yet I tell them that I'm in a relationship as they can see & I try to be as simple as possible.. & polite... yet she doesn't seem to like that.. I even cut ties with every single girl around.. which made her to keep fighting more & more.. saying that I'm dating in secret..& hiding stuff from her.. which I'm not doing at all.. !
She's no longer doing what I tell.. no matter what is it.. whether right or not.. she just started to want things to be going on her own way.. otherwise.. " Leave me " .. or be like... That she doesn't care about how I feel.. the point is.. I could feel her trying to play " The man " in the relationship.. Which I find strange... I don't know why would she do that.. We could be on a breakup.. for not on good manners.. yet she acts as if she's the happiest girl around.. posting happy stuff constantly..& at some point she'd try to make me jealous.. & once I catch up to her.. she be like " I'm none of your business "
I'm not even sure if she already talked with some other girl.. or guy.. who's somehow digged that idea into her mind.. to be dominant over me.. & that I'd do whatever she wants on her own way.. no matter even if it's not right..
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However , We've been like that for awhile.. Things are getting worse..
from what I've noticed that things would resolve whenever I try to satisfy her being the submissive one.. & just give up to her , which is kinda repulsive from my side.. I used to be the man , but I just want things to be calm & stable.. so feel like it's not me any longer.. I don't know what to do.. I don't know what's going on with her.. I'm totally mad & upset..
Your help will be appreciated ! . Thank you
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Also , It's not a 180 change.. It started on a run of a year.. a year of her trying to isolate me from people , getting jealous over the slightest things.. She'd get jealous if any eye contact happened accidently.. I just don't know what's wrong with her..
I do get jealous aswell , but not that way.. I'm a bit considerate.. to know when to get jealous & when not to..
But she's almost being jealous all the time.. scared.. worried..
Girls , My girlfriend is turning dominant.. Could you help me out?
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