Real quick, we're both sophomores in college, same college, and been involved for a few months. 

TL;DR girl I'm involved with is kinda narrow-minded, depressing (possibly depressed but idk), and has a very defeatist attitude. She may or may not depend on me for happiness, if I break it off and she spirals, WIBTA?

Now, I'm young, so idk yet if there's a difference or not, but I can't tell if she's in love with me or depends on me for happiness. It feels like the latter since she routinely goes on about how she hates every part of her day or week except for when she sees me. 

I'd like to break it off for that reason, as well as stuff like she can be really narrow-minded, has really low confidence/keeps hating on herself, can be somewhat depressing at times - she says stuff a lot like "there's no reason to hope for something since you're setting yourself up for disappointment anyways, so why bother", says that seriously as if it makes total sense. Another one is "my mother won't change her mind so why bother arguing". The stuff she's giving up on are really important topics to argue about as well, and idk but it kind of gives me this defeatist attitude. She also is absolutely unable to have serious conversations. If I try to talk to her about this stuff she just keeps cutting me off/changes the subject/asks me to please stop/straight up walks away, cause it's "easier not to think about it".

She says a lot about how her ideal day would be rain, staying inside, and netflix, which sounds nice once in a while but I don't think I'd like it that often. 

Long story short, I'm kind of more on the optimistic side and just the whole mix of defeatist -depressing-narrow-mindedness isn't working out for me.

The thing is, I'm nowhere near a medical professional, but she seems like she's depressed or definitely has anxiety (doesn't like talking about that either). On top of that, she's super stressed about her classes this semester since she failed one of them in the fall and is retaking now. Her older sister is getting married soon we think, and she always compares herself to her sisters (complains about her family in general), and since I'm worried she depends on me for happiness, I'll break it off and she suddenly hates every part of her life, fails her classes again, basically goes downhill. 

I know about the whole "it's their problem, not yours" but I mean... These are a lot of things that can go wrong. So WIBTA if I break it off and she spirals?