Yeah even if he didn't know them he should still be there for you, thats part of being a supportive partner.
I might. But I might not, especially if he didn't know the person. It could be that I don't want to have to think about anything else other than my friend at that time. It's a very personal thing to deal with.
I would like it. But if he had no real relationship with this friend and didn't know them, I would be fine if he didn't want to go.