I disagree that Jake hasn't done anything.
Kissing someone else at casa while you're coupled up is a pretty shitty thing to do. Having your head turned by a new person and handling it badly with the person you're coupled up with is also a shitty way to behave but these are basically kids, that kind of behaviour, while shitty, is perfectly normal. It's also kinda the whole point of the show and the reason we all watch!
Jake is different.
His attitude towards women is disgusting. He is friends with all the girls in the villa and yet totally disrespected them as individuals and his friendship with them by encouraging shitty behaviour from the guys they are coupled up with. It also suggests heavily that he's playing a game by sabotaging other couples so he can win.
His language when talking about Liberty is possessive. 'Made you MY girlfriend', 'you're MY girlfriend'. Everything he says about them as a couple indicates he views Liberty as a possession. An object. Not entering into a relationship of her own free will. Nope, he is dominant, in control of her. He made her.
For contrast look at Millie and Liam and the language they use. Everything they say is about being a team, THEIR relationship, togetherness, equality. They build each other up. When have you ever seen Jake build Liberty up? Treat her as an equal?
They way he manipulates the conversations with Liberty so that she is constantly flattering his ego. Always asking questions so that she is forever telling him how much she fancies him, how funny he is, how he makes her feel but never reciprocating. He's undermining her confidence, making her always prove how much she likes him in the hope that one day he'll compliment her or tell her how he feels.
Last night talking to the boys he 'speculated' that the results of the public vote and them not being a genuine couple were because Liberty doesn't talk to him if there's a problem. He insinuated it was her fault. But of course she doesn't talk to him, she's not secure enough in the relationship to feel she can discuss problems without him dumping her. He has done that deliberately so he has more control over her. If you're constantly worried that someone you love is going to leave you, you'll try harder to keep them happy by dismissing your own feelings.
Tomorrow night's episode... I would bet money on Jake trying to isolate Liberty from the other girls by telling her that they are poisoning her against him, that they are playing games. He'll reassure her that he's the only one she can trust.
His behaviour is insidious. He's awful and whatever Liberty's faults, she deserves better than him.