@Christina945 While it was wrong of both you and the host to do this cash deal, you seem to have taken a lot of liberties and abused the hospitality of your host, so I'm not surprised she wants you out.
First of all , you say you let your host know when you checked in that your boyfriend would be visiting you.
This isn't something you "tell" your host, nor is it something you spring on them at check-in. You need to ask permission to have someone visit you at an Airbnb , and you need to ask about this before you actually book a place, to know if it will be acceptable.
Then, to top it off, "My boyfriend had way too much to drink so I took him back to my place." The host had already told you that your boyfriend couldn't spend the night, only visit. Yet you not only bring him back there asking if he can spend the night, you bring a guy who's had way too much to drink back to your host's place. It isn't your place, it's a place where you staying. Your behavior appears to be quite disrespectful and you brought this scenario on yourself..