How can you tell he's the right one?

Hardi
So, I met this guy almost a year ago. And he is so sweet. At first I really wasn't attracted to him physically..I just really liked his personality. But I hurt his feelings by slightly leading him on at first and then telling him that I was seeing someone else. So for about two months we really didn't talk. But out of no where we started talking again. And again he is still so sweet to me... opens all my doors, pulls out my chairs, ect. And now I find him soooooo attractive both physically and personality wise. I just don't know what it is about him that I find so attractive. Do you think he's THE ONE?