Why would a girl quit in a relationship but stay in it?

Like when it comes to communication and you try to talk to her she’s always on her phone or not engaged when you talk. She doesn’t care about issues you go through what does the girl benefit from staying in this like this was a 2 year relationship and ultimately I feel like I wasted 2 years of my life in something I didn’t know wasn’t going anywhere at the time because had I knew I would have most likely made the decision to break up

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Why would a girl quit in a relationship but stay in it?
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