Why do you think he says that you are playing games with him. What does that mean?
As to the difference between determination and desperation, I presume you mean in your approach to this man? Or how he sees you?
If he sees you as determined, that probably means he feels pressure from you to become more involved, and you are maybe trying too hard. If he sees you as desperate, maybe he is unsure of your motives and does not trust you.
If you have not come right out as you said, and told him that you like him, he is probably wondering if you do, or you don't.
I'd say that it is time to sit and have a talk with him, and tell him how you feel, and find out if he feels the same.
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