When has it ever been a good idea?!

I have this thing about being ignored when I'm trying to talk to someone, it makes me feel like I'm going to explode.  The funny thing about this major pet peeve I have is that it's my fiance's FAVORITE thing to do! I will have a full conversation with him and ask a question relating to said conversation after and he says "huh?  I wasn't listening,  what did you say?" So of course not wanting to completely repeat myself I just say "nothing never mind. " And I leave it at that.  All would be perfectly fine if he didn't always insist I go through the conversation again!  Sometimes I think maybe since he knows I'm having to repeat myself because he didn't listen the first time maybe he'll actually pay attention,  but no i get halfway through and ask "are you listening to me?" And get no response so I just get up and walk away.  And it's never talked about again.  I have multiple times talked with him about how much it bothers me when he does it. But of course that doesn't do anything so now I just repeat his name in order to annoy him until he looks at me and then I tell him to pause his show or video or whatever he's doing until I'm done talking,  it works for the most part. 😂