Ha ha. This is less than 1/3 of my problems. I predict I'm going to end my life within 3 years based on my observation, unless I make extreme amount of effort in important areas of life. I'm pretty sure this is correct.
The way I get past this is by remembering human nature. The betrayal didn't hurt me that much because I know what humans are, why they do what they do, their motives, how they are influenced, how they operate, why and how they target, how they see themselves. I don't claim to know everything but it is enough for me to feel clear about things. It is enough that I keep my reality together. Usually betrayal shatters people's reality.
I had already been in a process of reconstructing my perspective and identity. I was already in chaos. While in chaos, I learned about psychology, evolution, sociology, history. I just pursued my interest. This enabled me to admit I was used. Otherwise I'd probably wouldn't want to believe it.
In addition to that, I learned the extents humans can go. For example, I've read carl panzram's autobiography where he writes his thoughts and murders. I've read about cannibals and bunch of other stuff. There is a psychologist who says if you were in nazi germany, you'd probably be a guard who torture jews. So I pursued my interest to understand human nature and I realized I'm like that and you are like that. I realized every single human is capable of tearing each other apart. I realized I am capable of that. I realized humans exploit to survive. I realized what reality is mostly belief, which is a choice. I should probably elaborate that but I won't. Basically I know how exactly my sibling operated.
There are things that we assume, things like he is my father he wouldn't purposely hurt me. But those assumptions are assumptions. I just observed without assumptions. I took notes about their behaviour. I interpreted them without prejudgements and realized nobody in my family want my good. They seem to like me. They seem to love me. But they love their investment in their future caretaker and provider. It is very very easy to see people's motives. Especially they think you are fool, you notice the microexpressions. Idk if I'm describing well. But yeah. There are also cases where someone close to you purposely try to make your life a bit more close to hell. Just because someone is your family or very close to you doesn't mean they wouldn't be malevolent to you. I learned just because you live, you are not entitled to humane treatment even from your family, parent or kid. That's how nature works. Of course society encourages good behaviour. That's not what I'm talking about.
TLDR. My plan about this is to remember what I learned. Then my goals are make good memories and pursue my interests. Working as hard as I can for them. So that's my plan. The other alternative for me is suicide within 3 years because life would be too unbearable to live.