My ex told me to go sleep with other people, I did, he called me all night to ruin the date?

so he leaves me and we have an argument (like couples do) he tells me he’s confused on his emotions and doesn’t wanna hurt me so he wanted to take a step back.
I, listening to the words he’s saying and not the ones i hope he says, say ok, and that i’m going out tonight. he says he’s happy that i am and he is too and to have lots of fun.

so I did it, i slept with someone else. unfortunately that someone else is the best sex i’ve ever had, but that’s besides the point.
halfway through my phone starts blowing up, it’s him.
he asks who i’m with with no reply.
he asks if i’m having sex with no reply.
he says “I’m trying not to have feelings but, I do”
continues to try to get me to respond, calls, and i do not answer.
until after about 3 hours of trying to get me reply I answer one of the calls.
i put sleep in my voice and say “hello” he then proceeds to ask me where i am.

I just want to know why he pulled so far away to try and ruin my date. he does this every night that he presumes i go out bc we argue. why do this
My ex told me to go sleep with other people, I did, he called me all night to ruin the date?
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