treat with indifference
In fact, this is a normal phenomenon, because after graduation, everyone is busy with their own affairs. So it's normal not to contact. Take it easy.
The initiative
When we want to contact a person, don't think too much, just take the initiative to contact. The initiative on the initiative, students, not so unfamiliar.
Give up when you should
Another situation is after graduation. The relationship between classmates has really faded. Then give up the right to give up, dedicated to a relationship, will only embarrass themselves.
Trust your friendship
I always believe that the friendship between students will not be diluted by time. So do what you have to do at that time. Don't hesitate.
Be considerate of others' difficulties
I remember just graduated from college is a very good friend, for a long time no longer contact. It turns out that something happened in her family. So we must be considerate of other people's difficulties. Because we don't know what happened to others.
Ask others
When we want to contact our classmates and are shy of speaking, we can help others find out about him. See if something has happened to him recently, and decide whether to contact him or not according to the specific situation.