We finally had sex and I felt nothing even though I Like him why is this?

I have been dating a guy for about a month and a half. things are starting to be a bit more serious now. so i had sex with him but felt absolutely nothing. i like him i do, but then we were doing it and i just felt like a robot. i felt no emotions. i did not feel bonded after at all he wanted to cuddle and in my head i was thinking ugh. but i really liked me and in general i am a person who feels a lot of emotions to people not numb. does this mean by subconscious does not trust him or doesn't really like him? why did i feel nothing to someone i supposedly liked. 6 months prior to this i did get out of a bad long term break up and i loved him. could this have something to do with it. but i feel i am over my ex so i dont know.
We finally had sex and I felt nothing even though I Like him why is this?
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