Yeah i would say cut her loose too. Maybe try to get to the root of the problem, but there's no guarantee that getting that out will make it better, and may actually make it worse.
Either way, you're just going to have to keep proving to her why she should trust you, and it's just not time well spent. It gets really tiresome having to explain every little detail about what you do/whatyousay/whay you meant when you said that/ wait....is this different from any other girl? :P
Seriously though, probably best to end it.
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