... are strange strange things ... there are so many levels to it ... some are so trivial that you forget about it the next day (like walking into a lamp-post, picking the wrong sandwiches or just generally getting confused) and may even laugh about it the next day ... but there are some which are serious, coming back to haunt you days/weeks/years later ... you regret it, feel sad, and somehow, your life continues to stay in that position, like a car without petrol ...
... it is hard to know what to do ... but ultimately, I suppose you have to accept that you have made a mistake, leant to forgive yourself, and believe that there is someone else out there who is in control, than just you and your own helplessness ...