What would you do?

So my fiancé works midnights, so when I’m getting ready for bed he’s getting ready for work. I was laying in bed last night, and under his breath he said “this crazy bitch at work” and I said, “what? Who” and he started laughing and said “it’s nothing” so I kinda freaked out and was like obviously there is something if you felt the need to say it, then couldn’t elaborate? Then he texted me later that day and said all the questions I was asking was a turn off.. lol.. o felt like that was him playing games with me. We just had a talk not too long ago about sometimes I’m overwhelming for him and I make things a bigger deal than they are so I’ve been trying to work on it. But I felt like he completely interrogated this. What would you of done in this situation? Would him saying that raise a little concern?

** I’m attempting to stay anonymous so I’ll elaborate a little more. Up until he left I was asking him to just explain what he was saying. I kept asking who the girl was and he’d just laugh and walk away. I literally just kept asking him to tell me why he said that. Then he left for work and said he’d text me and that’s all he said. That it was a turn off that I asked so many questions about something so pointless.