I'm gay, but I dated a 'gangsa' female, not sure if that makes a difference OP?
Career criminal, burglar, drug dealer, out and out wrong 'un'. She was in collaboration with a similar female friend (also a lesbian).
House looked like something off 'Only Fools and Horses'. 'Stuff' of certain themes would just appear and take up the whole house.
She was eventually abusive and I got out, but that was a real drip-feed.
I failed to see how bad things were for her, I think I couldn't see the woods for the trees. I am from a fairly privileged background, not wealthy but not short of opportunities or education. She wasn't. She'd gone to a school for troubled children and left with no qualifications.
I have always prided myself on being non-judgmental, and open, and see the good in people. I thought that was it though, she was less privileged and didn't have money, lived in a dodgy area, I didn't know she was anything other than that.
She never disclosed her drug dealing (or taking!) or burglaries etc to me until we'[d been together a good few years and me having never been around anything like that, didn't look for any signs.
For the most part, she was a lot of fun. I got a lot of expensive presents 'Ask no questions and I'll tell you no lies'. I learned a lot from her. She could be absolutely lovely and she was fiercely protective. If we went out in town she'd leave me to go and do 'dodgy dealings' but would buy me a glass of wine and tip the bouncer (a lot!) to not take his eyes off me, so I felt quite special.
Some of it, I still have to laugh at now I am out. For example years later she disclosed to me that once when she told me she felt ill so couldn't come out for something I'd arranged, that it was actually because the police were looking for her albeit they'd never have found her as they were looking for a teenage boy (she was in her forties, short haired, skinny and dressed like what you'd get if you google searched 'chav', dark tracksuit bottoms, hoodie, baseball cap etc).
I once stayed over at her house and had to climb up several rows of carpet to get up the stairs (nightmare with a cup of tea or glass of wine in one's hand!) as they'd filled the house with (stolen!) carpets and there was nowhere else to put them. Had to slide down them to go out in the morning too.