If these statements are applicable for your case, then you are in love.
When you cry if that person leaves and you hope to see him / her again.You cannot spend a second without staring at his / her portrait. Sometimes you just look back at the messages you got from that person aimlessly.
When that person is the first that comes to your mind if you see, hear, or smell something good. All senses become associated with the memories you hold for that person. Your brain is fully concentrated on that person, a fact which stimulates your senses to think more about him / her.
When you cry, cry, and cry when that person is away and you cannot stop thinking about him / her even after a long period.Even, after years and years of absense, you see someone coming who might look like him / her and your heart starts beating because you think that it is him / her.
When you feel small and hide if that person is no longer with you.This is a psychological state that you will definitely go through because you will feel useless and you will think that noone cares about you except that person.
