Oliver feels so bad, super bad. Why? His own kid can't remember him or anything besides the basics of life, all because Oliver had an argument with you on a mission, and you ran off, ending up falling and hitting your head badly.
The entire hospital stay he only left to use the bathroom, sitting by yoir bedside even when his wife Dinah tried to get him to move, Oliver refused, the last thing he said to you before you ran off was him yelling about you being immature, Oliver hates himself for it now.
When you woke up, Oliver tried apologizing... But you looked confused. You didn't remember anything at all. He took you home after the hospital. You didn't even recognize the Manor you grew up in. It hurts, bad.
"This was your sixth birthday, I took you to a fair, got you prizes, you saw a big panda plush and practically begged for it..."
Oliver shows you a picture in the family scrapbook. He's been trying not to cry this entire time. You're still so young, not out of your teens yet, you shouldn't have to be dealing with this... And it's all his fault.