When do you know that love is just that?

They say that when you are away from a loved one that you are used to being around all the time, you start to feel almost like you have the flu. But what if there is bad weather along with the time passing? Is this just one of them strange things that just happen to happen at the same time? How do you tell the difference between love and habit? I am sure I have found someone worth loving and caring for the rest of my life. But I think it wasn't until just now when I realized how deep my love is for him. He has only been gone a day and already I am sick like the flu. Maybe it's the weather or something I ate yesterday but I don't think that is the case. I have never felt this way before. Maybe love is something to be earned through a period of time. We learn to walk, talk and run. Who says we can not learn to love? A bond is made up on how well you do what ever it is that you gained the bond from. isn't this true about love as well? A relationship that gains love as you grow old with one another gains a bond of love and companionship does it not? Rather it is gained in years or felt that first minute your eyes meet, we all meet it one day. Would you know it when it comes to your turn?