You sound like a great and caring person so you should not be so hard on yourself. I had this happen to me helping people out only to be stabbed in the back when they got back on there feet. (i wasnt closely involved like you) I have now found just too look after number 1 yourself I know it sounds harsh but its the only way to do it. When your properly back on your feet you WILL find someone. All the best to you and believe it or not it will work out.