I'm going to tell my three best friends that they completely suck as friends and being super mad at them for abandoning me after my cancer diagnosis
Do you think your friends intentionally abandoned you after your diagnosis?
Yes they fucking abandoned me when I was dying
It is wrong they abandoned you when you were ill. You should try to make new friends or forgive them for hurting you.
Maybe
I'm sorry that you were neglected by your friends when you needed them the most. If they are not friends that you can depend on, it would be reasonable to make new friends that have been through a similar battle. Talking to your friends about how they made you feel will help you to heal fom their abandonment.