This thread is so depressing...
OP it is perfectly fine to be confused and upset about what happened. I would say try to speak to someone to help you make sense of your emotions. There are some really good charities that run helpline and places you can go to to access emergency services after a sexual assault.
I had a story a bit similar to yours (trigger warning)
I started dated a male friend of 5 years and had had no concerns about his behaviour a this stage.
We initially had consensual sex for the first time and I insisted on a condom. The second time something just felt wrong and I asked him to stop, very clearly, twice, but he did not and just continued... I also realised he had removed the condom. I was left in tears. After that he just acted as normal as if nothing had happened.
I was left numb and frozen and actually stayed the night because my body and mind just could not comprehend what had just happened (that my friend who I had known for years had forced himself on me) and I felt trapped. I left early in the morning as soon as I knew the trains would be running again.
I blamed myself for having agreed to have sex with him in the first place.
It took me days to process it and I ended up in a sexual health clinic where a specialist trained nurse helped me understand that although the initial encounter had started as consensual the fact that he had not stopped what he was doing when I asked him too meant that it was assault and she told me about stealthing as well.
I know there is no way this would stand up in court but at least in my mind I know that what he did was wrong. Have yourself tested as well because unfortunately my rapist also gave me a common STD...