How quickly can a person fall in love?

Aww this is so so so cute! I love hearing stories like this! I think it can happen real fast =) ..I've been with my partner for about a year and 8 months and we have a 4 month old baby boy, before that I was in a 3 year relationship, and before that I had a HUGE crush on this guy, we fooled around a little, but he was kinda a bad boy, never ever showed his feelings, but I'm sure he liked me. Anyway I was so so in love with him we used to hang out all the time! have a right laugh together. BUT my point is, I STILL think about him, when I see him in the street I look down, I feel so awkward, I go all fluttery but I really don't know what this is, I mean I've not been around him for years! I guess its because my feeling for him were so so strong, I really don't think it ever goes away. x