How to make friendships

•  Get on (with someone): have a good relationship.
•  Keep in touch (with someone): continue contact.
•  Get in touch (with someone): start contact again after not   speaking for some time.
•  Go out (with someone): have a romantic relationship.

•  Fall out (with someone): stop being friends after an argument."
•  Lose touch (with someone): have no more contact.
•  Catch up (with someone): find out what has happened during the time you haven't   spoken to   someone.