>>4 If she's not comitted to a relationship, then she shouldn't be in one.
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And not to sound like a dick, but if the reason she doesn't want to be in a relationship is becuase of stress, she needs to grow up before she ever gets into another one.
1. If the stress is because of "drama", she just needs to grow up and get over that now.
2. If it's becuase a relationship is too stressful in itself, she needs to stop dating those kinds of people, because she's obviously getting nowhere. Or the cause could be because there are disagreements. So? ANY relationship is going to have it's rough spots, but you have to be mature enough to sit down with your partner and work it out.
Honestly, it just doesn't sound like she's mature enough to seriously date anyone and be happy.