Is my friend a frienemy trying to Single White Female me? Am I making the right choice cutting her off? Am I crazy? Hello?

janaesaisquoi
This girl I just met <1yr ago knows no boundaries w/ my circle.
We hung out ~2-3x/month July-Oct., then she hardly responded. Then her dad passed early-Dec. I was texting her daily asking if she needed anything--short responses. Said she wasn't that sad cause he'd been sick for years. 2wks later, she group texts me & MY boyfriend (when "talking"/not yet dating) (she met through me) late Sat night asking if we'd go to church w/ her. I texted her directly saying I couldn't go but she could come over Sun night. My bf's dumb ass (lol) responds that he'll go. I wasn't going to be like, "No, you can't go to church with my friend who's dad just passed." I didn't hear from him all day, then ~6 she texts me asking to see a movie. I asked her to come over & we'd watch Netflix. Then, I get a frantic text from my boyfriend saying she just asked him to the movies, just them 2, since I couldn't go. He'd been running errands w/ her & was scared she'd cry if he said no. He told her he was sleepy & left. He said everyone at church was asking if they were a couple & he realized he fd up.

She kept inviting him to things w/out asking me. I'll coordinate my own +1. Why text my man when we're not close? Eventually I told her it made me uncomfortable. She said I was being ridiculous, jealous & insecure.

I still invited her out & she'd make excuses. Even said I was being insensitive to her grieving when I asked if I should give her space. I told her I'm confused about her needs.

Early May, my boyfriend told me to invite her out on his bday in case his fam&I didn't click. So she acts all fake & makes Jell-O shots. Then she starts texting my bf's bro who has a girlfriend of 7yrs. I told her the sit, but she's been texting him saying they should break up "but they're just friends". Then she starts acting shady to me again. My bf's visiting fam 2.5hrs away & said his bro got the whole fam to go meet her & her friend last night. Sans gfs! WTF?
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Updates
+1 y
So, my boyfriend finally returned and said that he felt that I wasn't nice to the girl. He said his sisters actually thought that the girl was his girlfriend because they could tell she liked him. She had actually found them on Facebook and messaged them asking if they had a good time at my boyfriend's bday the next day. Who does that though? You're my +1. I feel like that was yet another overstep. Also, she was sure to tell my boyfriend's brother that I was SO mean asking her to back off.
Is my friend a frienemy trying to Single White Female me? Am I making the right choice cutting her off? Am I crazy? Hello?
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