I've had a similar situation recently and came to the conclusion that I was just projecting my desire to be in love with my guy. I had intense feelings quickly but had to keep them in check so I didn't become blinded by infatuation. I don't know him well enough to truly love him but in my mind he could be the one for me. I could see it going somewhwre but had to let it go. I try to use my energy and thought to create a future. Possibilities are endless!
Don't give up on finding that feeling again that will last.