I think it is when you can't wait to hear from that person. You think about them all day and when you see them you literally get a funny feeling in your stomach. Those are thye first signs of attraction and a new love. A feeling of comfort comes next. Who do you want to share your good news with? Who would you want to be alone with on a desert island? etc etc. I am waiting for the growing old kind of love. I told my fiance after 2 months that I was in love. Couldn't help myself. We have been together for a litte over three years.