The fact that he is willing to try therapy speaks volumes about his commitment to trying to make this work. You also said you feel if you both try harder it will probably work. The problem is you basically admitted your feelings are not the same as before. My advice is to try therapy and if you still feel the same way then let go. Sometimes relationships need a short break. I also advise you to be honest about what you need in this relationship from him. To answer your question this relationship is definitely worth trying to save.