Based on what you wrote, I think you are wasting your time. You have already spent four years of your life in this up and down relationship. It doesn't have to be that stressful. If you date someone trustworthy, you won't have to worry about not trusting them.

Why doesn't he invite you to Amsterdam? And what does he have to think about? He claims you dumped him when you didn't and now he has think about whether or not he wants to date you?