At 16 years old i do ask myseft what is the most important " my girlfriend or my friends"? both of them are important but you will need to leave your friends time for your girl for build that new relationship and also your friend at a certant montant will need to let you along to build thier new ralationship,  the solution is to talk with
your friend that at a certain moment every body will have to let alone them friends for them girlfriend for a periode of time for biuld a new relationship after do so each of us will be back friends that the way it is.

Some people keep one friend all thier life,but for most of us friend will go & make new friends at the different time of our life.