Dealing with the deal that got away
There will always be times when a great deal gets away from you. You might move too slowly or not have the cash or saw some problems that weren't really there--the reason doesn't matter. What matters is how you manage the realization that this "fish" slipped off your hook.
You will never lose money on a deal you didn't do. So when you miss an opportunity, don't beat yourself up. Instead, consider what you learned and move forward.
Don't worry about the deals that get away. Focus on making the ones you are doing as profitable as possible.