How can this guy be so chill, after are break up friendship?

So long story short. This guy and I had a full out just yesterday. And he walks around and acts like chill, then even in the text msgs. He basically said, that he wasn't going to keep reaching out to me, if I am not responding back to him. But yet, still text OH girl that is already in a relationship with someone already, and just like fuck- how I feel. I don't get it, I thought him and I was suppose to be cool, he wanted to fuck- so I gave in and gave him that. Now, it's like he is a jerk and treating me like shit, like I am the one the owes him something. I even made it clear, yesterday that my feelings was hurt, and No sorry or anything, all he said: was He wasn't that type of guy like that. So I'm like so lost. :/. Help?
How can this guy be so chill, after are break up friendship?
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