Resentment is a difficult thing - I have a lot of it towards my mother - who is still living but from whom I am estranged. I think resentment is something you choose to hold onto, and you can choose to let it go, but it takes work. It won't go away on it's own. I still have it and am still working on it - and just when I think it is going away, something else comes into my mind and I know it is still there. My mom was emotionally and physically abusive for most of my life. She got a little better when I became an adult, but she would still lash out right up until my dad passed away. After that, I allowed us to drift apart, as I didn't know how to handle my relationship with her, without him. My family rallied around her, and left me to fend for myself, despite my having grown up all my life dealing with her abuse on my own. They were not around then, and then suddenly my mom was the innocent one who needed support when my dad was gone. I have a lot of resentment about that too.

HELLO friends, I know its hard but you have to forgive your mom and let go, take a step forward, talk about it and scream abut it then leave it behind, you deserve a happy life, holding on to resentment, anger, sadness and emotional pain, will only make your life a misery, make you depressed, unhappy.
Our moms failed to give us the love and care we needed but now that is in the past, this is today, its like an invisible chain that keeps us chained to the past, as our moms are now gone we have to bury the resentment and move to a place of forgiveness and peace, hope you can do it, because I know that it can be done, I found my peace in my faith, I pray you too find it, love*