Nah, she is rather possessive, not loyal. I can't see any scene she would work on that relationship or cherish Jeremy as a living person. She tries to fend off other BBC junkies of his junk, because she wants to secure it for herself as a sexual resource.
Just as Ivy. And she is his main pick up interest and naughtiness enabler on female side. The rest is just colateral demoralization stuff, as these two try to be together.
Possessive sure. But there is nothing wrong with being a bit clingy in a relationship. The issue though is her lashing out at others. Thats her biggest problem.
But her not being loyal? Lets ask the serious questions here... Did she fuck around on him? Majority says no, though is the possibility for the poor mans threesome with Ian-Lena if she happens to still be with her jackass of a boyfriend. Was she willing to endulge his fantasies, for the sake of making him happy? Yes. Sure, she wants him all to herself, as would any girlfriend wanting their boyfriend to be. Problem is though, Jeremy ain't loyal to her at all. Sure, she may enjoy the BBC, but she is still fond of the jackass enough to love him, even if he is scum and doesn't see her as a 'real girlfriend'. So in short, she was entirely loyal, even with her flaws.
Ivy is hardly an enabler. The only reason they have a rapport is the jackass sent her a unsolicited dick pic, and Ivy at the time, not knowing he was actually taken at the time, went with it. Now however, that naughtiness and friendship is waning thin, and given how we influence our opinion on Jeremy with Ivy (Ian) and how Jeremy deperately asks (Pathetic) for Lena to put in a good word for him, yeah there won't be any 'try to be together' any time soon.