Then friendship will start for a trial period of time and we all know that observation wont stop until you can say to yourself you know him or her from head to toe. Sometimes it takes longer when one part is a little bit reserve to her or himself or vice versa.
When two persons seems don't agree even to just a single thing they will call it quits. They will talk when they meet, laugh when there's reason to do so, friendship in a certain way to just get along being human being.
The certainty of friendship of two persons that agree in almost everything will bring to the highest level of relationship. The Best friend. He's there when you needed him or her. Through thick and thin. You have a shoulder to cry on. You have someone to listen to you. You know he'll or she'll understand.
When it happens to the opposite sex and were attracted to each other, when the guy don't know yet what's the next step, the woman is just playing by ear, their relationship will fall to a mutual realationship. Mutual relationship, beyond doubt that each person will try their best to please the other. Sometimes by heart they knew they love each other and satisfied with their mutual relationship. Just want to do something, equivalent to what they receive from that person.