Good for you, it is time to move on. He apparently has commitment issues. Why don't you tell him unless he marries you you don't want to talk to him again. I am sure he will brake all contact.
In all fairness, it is time that you are HONEST with your friend. It seems to me he has been there for you for a long time. Now be there for him even though you think he will fall apart. The...
I am so sorry what you are going through. Maybe one day you can be friends with him but right now your emotions are still raw, it will not be possible. When you talk to him talk about the logistics...
My advise to you would be to examine when the issue with your neighbor started. Is it really about the dogs? Unfortunately, this is your neighbor and you will have to deal with the situation and...