Friendship

Beware of isolation; beware of the idea that you have to develop a holy life alone. It is impossible to develop a holy life alone; you will develop into an oddity and a peculiarism, into something utterly unlike what God wants you to be. The only way to develop spiritually is to go into the society of God’s own children, and you will soon find how God alters your set. God does not contradict our social instincts; He alters them. -Oswald Chambers  Biblical Psychology

Being a better friend means giving of yourself, making your focus outside of just your concerns
Examine your transparency: are you showing your true self?
Examine you trust level: are you being open and willing to trust someone else?

Pyschology Today has these tips in two articles
Ways to make a friend:
Ways to maintain friendships