First of all, changing mind set.
Let make easy way. You need to keep own telling yourself, what past is past. It couldn't change anything, any moment unless you have time machine to control situation you like
Whenever you made a good terms of your own good, never, ever, claiming you can do better than that. You have to apply it as it just for your best, at this level, on this time.
Second, change attitude
You might felt you're sad because you had lose money, thousand of money in your 6 months business which has been collapsed because of many factors such as you are not focusing in your business well as your marriage been forcing you to lay back from your commitment. You can't resist of f5iens whom want you to spend for their lunch as 3 meals per a day.