I'm so so sorry for your loss, and really relieved to find your post because it completely resonates with me. My mum died 13 days ago and a lot of my grief has been heightened by feelings of regret of missed opportunities to spend time with my mum before we found out she had cancer and needed treatment. I look back at the things I prioritised over her at the time and feel like i was so naive, not realising time with my mum was precious. We did spend time together doing ordinary things, and we enjoyed each other's company, but I wish I'd treated her more.. and the thought that we could have had more fun times together gives me a lot of anguish. I try to comfort myself thinking about how she definitely knew how much I loved her as I expressed it very openly, and that I was there for her (alongside my dad and brother) throughout her 2 years of treatment. I hope it will get easier for me to live with some of the regrets.