Short reminder that 44% of lesbians and 61% of bisexual women are at one point sexually, physically assaulted and/or stalked (hi Amber) by a partner in contrast to "only" 35% of heterosexual women. So are we surprised all people invovled are just really horrible pieces of shit?
Not to mention the smell. Body odor (no, not Amber's stink) does not convey via internet. You can have an online relationship for years and meet and then you two can't smell each other. We are, after all, animals. We love/like/form bonds with our nose. There is this phenomenon of couples breaking up after the woman stopped the pill because she no longer likes how her man smells. Another reason to not take that shit.
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Amber and Kristine's relationship is toxic. There is no real attachment, hence Amber's BPD. Kristine no care about Hamber being sad or shit. Kristine cares about Kristine. Kristine is most likely BPD herself.