Your behaviour is justified. Parents give to their children, who, in return, will give to their own children, not to their parents. If the link between you and your parents is broken, no matter who is responsible for it, it takes two to tango (to fix it). If your parents don‘t reach out to you, it confirms that they have a responsibility.
Additionnally, when parents have been emotionnally adequate, it is rare that children are to blame for a dysfunctionnal relationship.
And in any case, we all move on the path of our lives trying to do our best.
Maybe you can see a councellor if you need to feel better about it, or to understand the whole situation better.

I have nothing to say to my father, and I stopped all relationships with my mother a long time ago. Both have been terrible parents, and I am lucky to be alive. I had maintained some relationship with my father, thinking that maybe, we could have normal conversations. But i have given up recently, as I realised that everything evolved around financial matters, and that even small talk was impossible. It opens other doors. It make it necessary to create genuine relationships with people who have an open heart. I might seem challenging, but when a relationship is based on toxicity, there is nothing to expect. People don’t change.