This is a typical case of lost love and losing interesting in each other. You must understand that if this carries on then both of you will seek new partners and will never be able to make a comeback in this relationship. The important thing to do here is to identify the cause for this sudden break, and to rectify this mistake. Start making things exciting, you have to start pursuing each other once again and you will need to take an interest, an active interest in each other. If you cannot rekindle your relationship naturally and find that you are pushing yourself or forcing yourself to do so then I am sorry to say but love's labour has lost.