Anthony is right Squeak, I don't think you fully appreciate just how dangerous of a position you put yourself in that first night. You could've very easily been raped.
The next time someone pressures you that much tell them they need to leave you house or you will call the police. End of story. You must give respect in order to warrant recieving it, and this man has clearly given you zero respect right from the beginning. Making you feel guilty is the first red flag, and a big one. You are under no obligation to explain anything to him after the way he has behaved. Yes, your lack of assertiveness may have been interpreted by him as a genuine lack of aversion to his promiscuity, but he is obviously not the kind of person any girl should be in a relationship with, regardless of their self esteem levels. Neither of you have a good sense of boundaries right now, you do not need to have any communication until you do.
The next time someone pressures you that much tell them they need to leave you house or you will call the police. End of story. You must give respect in order to warrant recieving it, and this man has clearly given you zero respect right from the beginning. Making you feel guilty is the first red flag, and a big one. You are under no obligation to explain anything to him after the way he has behaved. Yes, your lack of assertiveness may have been interpreted by him as a genuine lack of aversion to his promiscuity, but he is obviously not the kind of person any girl should be in a relationship with, regardless of their self esteem levels. Neither of you have a good sense of boundaries right now, you do not need to have any communication until you do.