I think you were not just into him! That's it....just don't beat up yourself over this....it's okay....I think you need the physical attractions as well....
When I was younger, I used to give more time to THE NICE GUYs....but I don't do that anymore....I know if I'm not into the guy, I won't be in future too....however, some of my girlfriends are different....they said they fall in love later in their relationships.....I'm confused sometimes, not sure if they are really in love or they are just used to the partner!!!!