I’m so sorry for your loss. I lost my Mum on the 28th May. I am feeling your pain with you. You are a very caring person and your actions speak a thousand words. Saying I love you seems so simple to you and I, I guess others find those words have a different meaning and block them out. Your Mum did love you and that is the memory you hold onto. Overlay the feelings of regret with self realisation that you were and are loved. Bless your children with those words each day and remind yourself how loved you are. You are blessed to have a loving family to support you through these difficult times. Your siblings may have their own doubts about love..? I hope you are okay.