Rant: Why is my husband

Constantly including his colleagues into my business? We work in the same industry but in different frameworks. I have my business and he works for a company. Every time I have a business development idea, he goes and tells it to his colleagues or he wants me to partner up with them. I don't want to. I have made that extremely clear. We have had numerous fights on this. And he always acts like what I talk about is stupid, then goes and talks about it to people and basically kind of steals it away from me. Why is he doing this? He says there is no ill intend and he is not seeing it like that, he feels bad for people. This frustrates me to no end. We have fought twice this week about two different incidents. I could just keep my thoughts private, but it sucks, because I want to share everything with my SO but clearly this is impossible here. I thought he was supposed to want to lift me up, be my ally...