We all have our letdowns - I sense you have had a disappointment lately.<br />
Care to share?
Sorry to hear that. These things happen and all we can do is learn from the experience to make sure we don't repeat the outcome.
I find it helps to honestly appraise whether we made the best decisions we could with the information available - If we didn't - what could we do better. If we did, then that is the most we could do and you should not beat yourself up.
Two things :
If you could have done better - Next time do better.
If the problem was outside your control - just make sure you are aware of it and move on.
If you want to message me with more detail perhaps we could talk.