If you haven't sold, then you haven't loss anything. Stop comparing the highest price to what the price is now. You didn't sell at the top so it was never "your" money. Until the money is in your hands, it was never yours. Just comparing the highs to the lows will make you go crazy.
This answer is the most accurate and even nothing to add. Just keep your coins in the long run and sell when the price is greater than the price you bought for, then there will be no loss, only profit.
I agree with both of you, it's best to look and compare only the prices that were at the time when you bought/sold and the current prices. Looking at the all time highs and lows is pointless.