The words friend and free come from the same root word, suggesting that one aspect of friendship is the freedom to be (our) in the company of another person.
Most friendships begin with shared interests or (active) which gradually develop into mutual trust, openness, affection and (loyal). We like people who share our attitudes and values. When someone agrees with us or makes the same (choose) we have made, we gain confidence in our own views.
There is also a (tend) for people to enjoy the companionship of those of the same (economy) status and level of education. Friends may also share an altruistic goal, such as a concern for (just) or the cultivation of the arts.