The right friendship is important, as is spiritual friendship.
Before the fall in Genesis 3, everything was good, except for Adam being alone. God decided to make a helper suitable for him (Genesis 2:18).
God is not alone. The universe was created by God of three beings—the Trinity God. The Trinity God was there from the beginning and would be there in the new heaven and Earth.
Needing friends is healthy. Considering His disciples as His friends (John 15:15), Christ regularly expressed His inner thoughts, such as his distress, with them.
Friendship typically comes among those with common interests, passions, or goals. They become fellow travelers in life.
Spiritual friendship comes among those with a common desire and love for God. For example, look at Paul and his spiritual friends. They shared their feelings and faith. Together, they prayed, wept, embraced, and kissed (Acts 20:36). They shared their possessions, such as opening their homes to Paul and his companions (Acts 21:4).
They counseled each other. Paul’s friends urged him not to go to Jerusalem (Acts 21:4, 12). Good friends sharpen each other and make each other stronger (Proverbs 27:17).
They share their commitments. Luke was aware of Paul’s danger in Jerusalem and in Rome, yet he went with Paul (Acts 20, 21, 27 and 28).
As we age, we tend to have fewer friends. This could be due to a lack of time or some friends disappointing us. Be aware that friendship needs time to build. For example, early Christians devoted themselves to fellowship, meeting every day and eating together (Acts 2:42, 46). Such activities helped them build up spiritual friendship.
To conclude, spiritual friendship is healthy. It typically exists among those with a common desire and love for Christ. And it needs effort and time to build.
Summarized from a Tim Keller sermon:
他们互相劝告。保罗的朋友们敦促他不要去耶路撒冷 （使徒行传21：4，12）。好朋友彼此磨练，使对方更刚强 （箴言27:17）。
通常朋友会随着年龄的增长而减少，或许因为时间不足, 亦或是一些朋友令人失望。要意识到属灵友谊需要时间来建立。早期的基督徒献身于团契，每天见面，一起用饭 （使徒行传2:42, 46）。这些活动帮助信徒建立属灵友谊。