Shalom in Yeshua ginahunt3, Sorry to hear of his passing, God bless him.
The decision you made was the right one so please don't feel guilt about it. We are taught that when our loved ones close their eyes in sleep (the old name for death) they awake in Sheol. What's more they can hear us, so how about just saying to him, how much you love him and say bye to him now.
Talk to him, and talk to your mum about him. This will help you and her in the grieving process. Keep coming here to if you need support or want to talk things through.
May God bless you