cursh or something sexual

i kinda have a cursh on this guy at work but the problem is is that he has a girlfriend and shes about to have his first child anyday now. ive known him for about 6yrs and i went to school with his girlfriend for one semester. but we became friends cause she used to work where i work now. i had a friend who told the guy that i had a crush on him but he didnt respond to me about it. when im at work he usually comes up front to get a spa gun or come to read the newspaper or just sit up front to chill. he dosent work up front he works in the back. my friends at work teases me about it cause they say he only comes up there when im there. i have dreams about him constantly. i dont want to be his girlfriend i just want a sexual relationship with him. what am i to do please help me.......