Should I be upset that I did not get more attention from my ex during my cancer treatment? This is what lead to a break up.
What were your expectations of your ex?
I really wanted her to be there and to take care of me
I hear you, and I think it's ok to tell others if something weighs on you heavily. You should just do it politely and respectfully and you'll be alright.
Give me some advice
It seems like you need closure from that relationship. It's best that you express yourself to your ex. This will help you to heal and move forward.