I agree with you that I certainly don't want people to think I am only focused on my own needs in a conversation. I'm embarrassed it's taken me this long to learn to try and adapt to other styles, particularly my spouse's.

I wasn't really trying to rationalize interrupting. As I note in other comments, so much depends on context. I can promise you my best friend and I do not feel "jumped in" upon. It's more like we're running together to the same place.