True, I'm glad you are enjoying your summer and keeping busy.
I was very sorry to see that you sent your xh a small sum of money. True, the amount of money was set high and believe me, he knew how to manipulate you once again. You've now set the stage for him to come to you every time he needs money. He knows that he can wiggle around your feelings and get what he wants, no matter how much.
Please think long and hard in the future about standing firm in not giving him money. Your xh is a grown man and he needs to take full responsibility for his life. You are now divorced and owe the man nothing at this point. I'm sorry if I sound harsh, but I do not like to see people manipulated for monetary gains. He knows he can get to you and I hope and pray he doesn't tray it again. It's not whether you can live cheaply, but the principle of the entire mess...he wanted out...he should now stand on his own two feet. After all, you are attempting to do that for yourself.
I do hope that the rest of your week is good for you. Please take what I'm saying w/a grain of salt...only you can decide what to do in your situation. I'm just voicing what I would do and have done when my xh has asked for things after the divorce.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.