What happens when i am attracted to my straight friend?

We just met about five months ago. He has everything i am looking for in a man. He makes me laugh and is always trying to make sur i am ok. but at the same same time he gives me false hope about a real relationship whether it be ual or just as friends. I saw going through some financial troubles and he offed me to move in with him when he got his apartment. Then he turned around and moved in with some woman that he hardly knows. The second night i herd them having and i got sick to my stomach. Needless to say i left that apartment and now am homeless. I told him that i would try and just be his friend but that it would take some time. Two months have gone by and i still can not get over him. I think about him every waking moment. I have not talked to him in about a week now I laid it on the line and told him that I loved him and not in a friendship way. The only answer I got was that he is straight . I told him I can not change or hide the way I feel and that it best that we never speak again. I have never felt so strongly about a person be for the way I do about him. I still want him in my life but do not want to be around his hetero world. What can i do ??