He knows that i have a crush on him, at the same time he is my assistant. my officemate knows that, and they always pushing me to go for it. I always show my affection to him but he think it was only a friendly affection.

when some guy approach me and making a conversation, he always stood up and go away, and banging away outside. my friend told me that he was jellous but he didn't show me even a little bit of a sign.

When we are together at the office, he was so happy with me, after office hours he always run off and leaving me behind.

I don't know what to do.