I do everything from the laundry to the bathing to the grocery shopping, doctors appointments, pick up the medicine, and give her her medicine, make all three meals plus snacks, take her anywhere she needs to go. I’ll take care of her bills, everything.
You have probably learned some skills as well as some useful life experience. That’s done and dusted, and there is no need to continue ‘learning’. It will get worse, not better. It’s time for a new plan, with her and with BF. They should have learned the lessons too by now.
If they don’t agree to a big big change, then you really are being exploited. You should be more than ‘a little resentful’, and you should be making your own new plan. It can be hard emotionally to quit relationships, but if they won’t change, this is a very bad sign for the future of either relationship.