My H freaked out when he found out that I had told my neighbour about us possibly separating, he has only told his brother so far. I was confused because I thought if we were separating why wouldn't we start telling people? Especially our neighbours, as they would start to notice things. Well, I guess it turns out everything is not always black and white with this sort of thing.
I found that whoever I told about what was going on was very supportive. For me I also felt a bit of relief in telling a few people. I was surprised when I told my neighbour about everything and we ended up talking a fair bit, when normally we wouldn't talk about that kind of thing. We often just sit on her front porch and talk about how things are going. Of course, be prepared to let people know if you are not ready to talk about things yet, or that it's a private matter.
It is up to you to decide if and when you are going to tell people. If you are a private person you might feel that you don't wish to tell anyone right away, and that would be understandable.
Perhaps your H just feels uncomfortable because he is not aware of which people in your life know about your situation and it catches him off guard.
M: 8 yrs T:14 Twins:7 S:5 BD:'NLILWY': Feb/2013 Mar/Apr/May: MC June: "living in limbo" Sept 12: H moves out Oct 20: reconciling Jan-Feb 2014:MC Feb 2014: separating, and H moved out.