I will try and sum this situation up as best as I can. 

My (26f) cousin (47f/mother’s cousin) and I have been in each other’s lives since I was 17-18. Through the years I guess I can admit she had a bit of control over me. Thinking back on how I would jump when she said to whether it was to come to her aid, she would be very critical of my weight and the way I dressed - I guess in a way she made me codependent on her. 
Fast forward to dating men and she gets a friend and all of a sudden her whole world revolves around him - he would show up I’d have to leave and also accept this situation. 
Fast forward some more and we move in with each other, after many family and friends questioned why because we had already had so many fallouts. I’m with my fiancé at the time of move in and her and I had an agreement that if everything went well with his and my relationship he could stay and we’d get a 2 bedroom, if it didn’t work out at least we had each other. A few months in her story changes and I started “treating her poorly and things were different.” Admittedly I was a little snippy; being in a new relationship playing Susie homemaker was new for me and took some time to acclimate to. I apologized for my actions as at this point her and have been together for years and shouldn’t treat someone like that and asked  how I could fix it. Which I received no response. We proceed to get into a blow up, well I blew up over pent up anger and frustration with her - now we do not speak for a few weeks. Another few weeks go by and we’re some what civil, catching each other in passing, having conversations here and there, nothing of what we used to, just the same old work banter and whatever new gossip is afoot. Then the bomb hits - management “found out” threw “maintenance” that my fiancé was living there and he had to go or we sign the lease adding him on as an occupant. She refused stating “things have changed and there’s things I would’ve done for you before I won’t do for you now,” and I half lost it. Not because of her refusal but for the extra shit said. 
Fast forward a month and she wants to release me from lease as of 9/1 and I cannot do so as I have to find somewhere to go and this is where is all goes to shit - every other conversation has been a threat to be taken to court. I get her off the lease for 8/31 so she can go. Within two weeks of said agreement she has still been texting me with bullshit - yet again threats to be taken to court over her security. I can’t tell you the amount of stress I’ve been under but I’m handling it like an adult - or at least I think so. Definitely more details here and there, more than welcome to inquire about any gaps if you need clarification. 

Basically she’s acting like a jealous ex girlfriend at this point but is this borderline sociopathic behavior? Is this codependency? Is this just her being a petty asshole trying to get a rise out of me ? 

 Not sure if this is this place to ask advice on this top. Still trying to just a reason for her actions other than being a petty brat lacking control over a situation and pure jealously. 

Do I sound crazy ?! 🤔🤔