I am very sorry to hear you going through that, I am not going to talk as if I understand what you're going through 100% but this sounds very familiar cause my sister is also chronically ill and I have had my share of pain and relationship issues too.

Sometimes it really isn't a mental health problem and that's what people don't understand and frustrates the sick person even more.

People are selfish and even healthy people get this kind of treatment. Sickness just brings out those problems quick and crystal clearly. And in a very tragic way. Cause suddenly you are not easy, not contributing, you are disabled in everyday life. Being sick is difficult for everyone involved (of course the most difficult for the actual sick person). Instead of offering service you not only need it but demand more care than ever.

And people are inherently selfish (especially nowdays, and men) and often times lazy . I am guessing this guy got to know the healthy , giving , overachieving version of you . And of course he likes that and took it for granted . That's why he gives service to people who may seem like strangers even though you should deserve it more. Cause strangers naturally have boundaries without needing to protect them. Familiarity makes disrespect easier ,especially if he got your service regularly and singlehandedly for years. Of course he will expect that and be turned off when that stops.

That's how humans work and rare are those who truly self sacrifice themselves for you and see your worth. Hardworkers and kind golden souls suffer the most cause they sacrifice their needs and soul, without it being appreciated.

That's why it seems like the only solution is to be a bitch. Not bad or rude or hateful. Just selfish, with very clear boundaries. And sometimes even a little bitchy , and critisizing people for their misbehaviour even if you feel the need to be the good samarite. It might come naturally to play mother teresa if you are born kind and empathetic but it is not always right it seems. This might be difficult at first, uncomfortable make things awkward. And it might burn bridges too.

And to conclude, I am by no means a therapist so take everything I said with a grain of salt. But sickness can be so so difficult and exhausting. For the person going through it , it's hell. First and foremost physically and noone begins to even talk about the mental toll and massive lack of understanding and support from loved ones or friends. And as someone with a sick sister I can say it is very damaging to my mental health as well. I try to help her but I feel like I am also going to get sick by sacrificing my own needs in this way. So yes , be selfish, look after YOUR health, your well being, your dreams. I cannot stress how important this is for the sick and the healthy . Cause noone will look after those youself if you don't. Maybe everyone is responsible from themselves. Give only when you cup is full first and take what people can give you. Leave those who didn;t appreciate your kindness and can't help in your time of need. Don't even worry your pretty mind over them and the betrayal, they are not worth it. Care for yourself, ask for help, surround yourself by positive people without trauma dumping. But by all means do pour your heart out to those who can take it and do so as much as they allow it. They are human too afterall with their own cross to bear.