Fiancé wants a 3 month break?

[A]

We have been together for about 4 years. We have also been through more than most with deaths, major surgeries and illnesses in our families, and the loss of a child. Finances are also strained so it has been rough for us. I know he is very stressed and not himself, but he says now he needs to get help and wants a 3 month break...we have already been separated on his break for 3 weeks...we have not seen each other, he sends maybe one text every few days, but doesn't say he loves me, doesn't call at all, but he will answer if I call. But he keeps the calls very short. I can't keep doing this, I'm so hurt...I've offered more space, to help him etc...he refuses. He even deleted me from all social media, but I can see he is still using it. Now I really don't believe there's anyone else since he doesn't leave his house, and I know he needs help. Tonight I told him I couldn't do this anymore and he replied that he promises we will work out after he gets his help. He is a grown man at 42, this is very unfair to expect me to sit and be faithful while he does his single thing like deleting me out of his life for 3 months. There's no way it could be the same and just pick up like nothing happened. I'm very hurt. Am I unreasonable for saying goodbye even though he needs help? I feel bad for him, but he can't see the pain he is putting me through
Yes I believe he is very depressed, but he refuses to talk about it or what he thinks, which makes it more difficult for me to understand...he will avoid the subject at all costs, he always has avoided any important conversations though...I can't help when I don't know what he's thinking. It saddens me that I can't help, but this has crushed me inside that I can see him online chatting with his friends and not a single text from him...I'm just afraid to sit here waiting when he may never call again...
I'm sorry but I don't feel selfish when I can see him chatting up his female friends and deleting me!