Okay /adv/ I need all the help I can get with my current situation.

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Okay /adv/ I need all the help I can get with my current situation.
>summer break starts
>start chatting ocasionally with one grill from a theatre class who we casually spoke to each there throughout the year and more so whenever she was down about something (which was all the time #first world problems
>anyway so we start talking and eventually go out to hang at an amusement park, two in fact and she goes on as them being some amazing times and how she wants to hang some more but only at amusement parks like no where else.
>I tell her nah I don't really feel like it because nigga it's expensive as tit.
>starts going on this huge rant about how no one likes hanging with her, no real friends, how I make her so happy.
>I kinda liked her too at first but then I realized she is nothing like my ideal woman and I was just desperate for companionship but now I think she's too attached and I'm afraid of just letting her go will make her go off the deep end.
I messed up right? I shoulda seen the signs that she was kinda crazy.
Tldr: how do you know someone truly has feelings for you? Like I'm worried for her but at the same time I'm wondering why I care so much because before Summer I never even looked at her as anything more than that kinda large girl in class who has really normie tier problems.