The truth is none of us know what really went on inside Jack's intimate relationships. Everything is inference based on what SHE has put out on social media; neither Leggy or LJC or OH or Baby Daddy nor anyone else has ever spoken publicly about being in a relationship with her.
From what we've been told about Baby Daddy, he's likely been overawed by Jack and her family having more wealth & status than him and, if he is an ordinary bloke with a fairly small, quiet life (not judging), he may not have had any idea of how to handle Jack when she acted out. I have huge sympathy for him because it sounds like he has a solid family around him and he gets up and goes to work every day and looks after his children and he will have to deal with Jack for the rest of his days. My sense is he does his best and provides stability for their child as much as possible.
We simply do not know whether any of them recognised that Jack behaviour fits with a narcisstic personality disorder while they were embroiled with her. I wouldn't have known, if it were me.
We don't know whether any of them tried to talk Jack out of her grift while they were with her or not. It's a stretch to assume that they were tacitly complicit simply because she didn't change her ways while with them. Or because they didn't go public and bring her down; that's putting a huge responsibility on them and, ultimately, Jack is the one who has to take responsibility for her own tit.
I think it is fair to assume that none of them were monitoring her every tweet and it's really on Twitter that the grift played out, with the begging and sob stories and repeated links to Patreon and PayPal. I believe only LJC is even on Twitter and she is very intermittently there. So, I think we can assume she wasn't seeing every Jack screed or fight there.
Some things about all three: OH, LJC and Leggy. All of them seem to work very hard, with potentially long hours. Perhaps OH had more regular office hours but he was also commuting into London which makes for a long day. LJC and Leggy both work in sectors with long hours, irregular schedules and late nights. So, I can't imagine there was much head space or time in the day to read Jack's every brain fart online. And that she curated what she told them to their faces.
I imagine that lockdown was a revealing and difficult time for LJC. For the first time, she was at home all day with Jack, thereby witnessing her raging and shouting and complaining about lost work etc, undoubtedly in person with her as well as online. At the same time, LJC was just starting her new job at Channel 4 but was far away from the action in Essex and presumably spending long hours in Zoom calls and working every day. It was a very big leap up into a senior role AND at this challenging time for news.
Can you imagine trying to concentrate on your work while manic Jack is popping into your space every few minutes with her new craft idea, some tit recipe, another outrage about someone something on Twitter? Jack has the attention span of a fly.
Her online begging also went through the roof in lockdown. And possibly Jack was both whining to LJC about getting her work opportunities while also possibly bullying her about joint expenses. LJC would've been really stressed and may not have joined all the dots while immersed in that living hell.
Whatever else happened during that strange time, LJC tried to make a break for it so she must've been awakened to Jack's worst behaviours by then. Why she went back as a bubble buddy before finally breaking it off is something we just don't know.
I think the point someone raised about power is relevant. From what she has said, Jack seems to value men more than women -- she's much more concerned about pleasing her father and grandfather than the women in her family. We don't know if she has any close friends but she likes to imply that her housemates, friends who help her move house /lift stuff / do things for her are men. I think she has more respect for men than women and I also think she probably picks partners who she feels superior to and that she probably bullies them.
The power and gender dynamics of a same sex relationship can be complicated but I would guess that Jack always likes to be top dog, her fragile, ill, smol pixie charade notwithstanding. I can't imagine how difficult it must be to have Jack playing out her tit, with its accompanying rages, lying and manipulation. For Leggy and LJC, there must have been an initial spark of attraction and feelings of love and I imagine it took a lot of strength and perspective to realise their love wasn't ever going to be enough for Jack and that she was likely to suck them dry.
So, I personally hold a space of compassion for anyone who's been in an intimate relationship with Jack. I know she would've flattened me and hollowed me out and I wouldn't have understood what was going on at all until I was wrecked by her.