She keeps blowing me off then apologizing what should I do?

Anonymous
So this girl I dated a while back is really great but she's starting to annoy me. I used to be crazy for this girl but she's become so confusing that I just need something to change. I'll ask her out and she'll agree, act excited, then blow me off last second. Then she'll apologize and start texting me. This has been the fourth time now. We make plans in person but they never come through. When I text her she takes forever to reply if at all. If it had been any other girl I would've quit trying ages ago. But if I go a few weeks without texting her she'll show up at my dorm with some bullshit excuse about why she needs my help. Last time she was too drunk to go home (she wasn't). The time before that she needed a place to do her laundry and I was the only one she could call (I wasn't). She's always talking about how her mother loves me (which she does) and occasionally does weird stuff like trying to see what our babies look like but I mention anything long term and she freaks out. I've known this girl for 4 years now. I've been by her while she had surgery, been her friend through I don't know how many breakups, and she even gave me an STI. She's always throwing out overly exaggerated compliments and telling me stuff to make me think I matter but it's all just words. Empty words. She's done everything from freaking out and blaming me for "abandoning" her after SHE dumped me to crying after I dumped her when she told me she cheated (this was weeks after I found out that she started dating me months before she stopped dating her ex). I either want her to date me like a normal person or go the fuck away. It's frustrating. It's like she knows I can't be mean to her. It's one of the reasons it takes me so long to date anyone in the first place but she's really stretching me thin. Honestly her mother is the only reason Im still even willing to try with her. She's an extremely fun person and a joy to be around but I just don't know what to do
She keeps blowing me off then apologizing what should I do?
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