Tetra, some girls would fall for that, so pat yourself on the back for being smarter than to fall for his scam. Being nice to him wasn't a crime, it was the right thing to do. Now he's shown his true colors and you can delete him from your life if that's what you choose. You can't blame the guy for trying! You'd be a great catch.
The thing with your grandmother is going to take time. I don't know if it ever goes away completely. She would want you to be happy and to remember her fondly, but not to let it interfere with your life.
The job thing - you will get rave reviews from your current employer! You've done a really good job.
Have you asked them to find you a permanent position when the contract is up? I would ask.