What does it mean--my blah demeanor?

So, me and the guy I'm dating got into an argument today (only been dating for 3 months).. I told him I wanted to end it between us because of whatever reason..

He texted me a lot tonight but I ignored him because I said everything I could to him. Trust me, I said a lot on the phone and then in text.. It looks like I wrote a novel lol .

Anyway, I just ignored it all as he was only defended himself and not saying anything that made me feel like I made the wrong decision.Then he just now text me and says "well OK then" and so I gave in and asked him what he would like me to say or do.. and he responded with how the weather is, I guess to make me feel like everything is normal again.. I ignored him and then he says "and nothing I guess" so I responded with alright..

Then he text me and says "I wouldn't expect anything different from you... sums up your whole blah demeanor"

I don't get that though... my blah demeanor? what would you think that means?
What does it mean--my blah demeanor?
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