I have no clue what to do! ?

I have a FWB and I have fallen for him. My ex broke up with me about a month ago and my FWB before my ex was there and helped me through the break up. He has helped me with a lot. He seems like he wants something more too but I've told him that I want more and he said he couldn't because he was moving only 45 minutes away in a couple months... I don't want to lose him, I don't have any clue on what to do, please help me