drift apart

I drift apart from my friend.

私は友達と疎遠になります

I drift apart from my friend after graduation.

私は卒業後に友達と疎遠になります

I drift apart from my friend after graduation because we are both busy.

私は卒業後にお互い忙しくて友達と疎遠になります

I drift apart from my friend after graduation because we are both busy and we're in touch less.

私は卒業後にお互い忙しくて連絡が減りながら友達と疎遠になります

I drift apart from my friend little by little after graduation because we are both busy and we're in touch less.

私は卒業後にお互い忙しくて連絡が減りながら少しずつ友達と疎遠になります