Why my losses become larger losses?

As I review trades for the upcoming week, I become infuriated that I will often put in a stop order on the profit side, but neglect to put a stop on the loss side. Most often I could've exited a bad trade for a small loss, but my "hope" that the trade will reverse, turns a small loss into a insurmountable larger loss. This is NOT Acceptable, as a business.

I am upset with myself as I still don't learn from my losses or develop the discipline to exit with a small loss. Don't allow a small loss turn into a snowball of a loser.

I want to control my loss with my current SPY calendar . If SPY goes above 89 I will exit the trade.