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I think it's more like the boyfriend is shitty. He tried to seduce Julia because he couldn't sleep with Jemima. If any, Julia did well showing Jemima what a scum her boyfriend was. And I presume that Julia is holding grudge against Jemima because Jemima had a better life. And because they are twins, she thinks that she supposed to has what Jemima has. It's unreasonable but psychologically, it makes sense.
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I'm sorry but it does not matter if she has a mental issue or not. It does not excuse the shitty things that Julia did to Jemima and thinking she can get away with it. I'm diagnosed with MDD, major depressive disorder, with anxiety from two actual psychiatrics and I've had a shitty life as well that caused my depression but I know better to not do the things Julia did. More than likely, she knew better as well but didn't care who she hurt. FYI to people, just because you have siblings you are NOT entitled to what they have! Not even with a mental disorder or otherwise. ( ̄へ ̄)
Im happy that she killed herself.Using her sister as an escape for every thing she did and thinks she can just leave her child on some one who she constantly sh*ts about like wtf why does she need to steal her sister's boyfriend?! You cant use your shitty life as an excuse for everything!