In a rut

I know I love my guy. But lately we have been arguing so much more than normal and I know its because he is in a depressive rut. We are working on getting him help and therapy and I have always stuck by his side and tried my best to help him through. However, after so many years it is starting to wear on me. There isnt one thing he likes anymore and whenever I try to start a conversation about his or my interests its like I am annoying him. I just dont feel loved anymore and I have told him all of this but he either doesnt see what I am saying or he will say he will work on it but never really does. I feel horrible for questioning our relationship when it isnt his fault its more the chemical imbalance that causes his depression but I wont lie I feel my own light dimming after so many years of trying to hold everything together for us. I am sorry for the long post I just needed to get my thoughts out. I love him and he loves me I just dont know what to do or where to go from here...