You had a summer love, fling, relationship, and it ended. And she didn't do it in a mature way. It's normal to have feelings towards that. What is "sucked in"? considered. Caring? That's human nature. I don't think we can be with someone intimately and have 3-4 hour phone conversations with them and not be attached on some level. You liked her, it ended and it hurts. And that it is ok. And I am sorry that it happened and the way it did. Very immature on her part, but I saw the slow fade coming. She isn't mature enough to handle a real breakup.
As for your online date. You've got to calm down. I didn't think she was putting you off at all. She suggested an alternative day because the proposed week didn't work for her. She was expressing a real interest.
I think perhaps ego is getting a bit in the way. You can be knocked off your feet a little. It's normal. Don doesn't have to be tough guy who doesn't get attached all the time. It hurts when we are interested in someone and they aren't interested in us the same way. All normal human emotions!
Give this new woman a chance, and don't go assuming she is blowing you off or is broken, or whatever. She may not have job right now, but if she is a responsible woman, she is busy using that time trying to find one! If you are going to continue to date, you have to give some credit to women.