nagatsuki, why dont you understand that he´s just being nice to you? okuma for all i know is still into chiyo, meaning you got no chances of being with him and will only end up hurt and hating chiyo when he finally tells you about it...
I think ookuma would like to be just a friend in order to be more close to chiyo. More impprtant what he want to do next - wait till chiyo and igarashi break up or try to make them break up?