What is wrong with my mother?

Sorry for the long story. I'm 18 years old, bi male, parents divorced. I haven't been spending time at home because the house is empty until late in the evening. To beat the loneliness, I just go out with my boyfriend and hang out at his house until 12 a.m-1 a.m. His mom likes me and she's really cool. Well the other day I was talking to my mom on the phone and she started yelling. I asked why she was yelling, and she just kept on, so I hung up to keep myself from saying anything stupid. The next day my boyfriend told me something he heard from his mom (both our moms are friends). Well he told me that my mom had told his mom that she wanted me home by 11, and that she was going to talk to my dad (he doesn't know I'm bi, much less that I have a boyfriend). That made me even more upset from the last night, so I went and confronted my mom. I admit, I was sarcastic and distant, but I never disrespected her during the confrontation. She denied the allegations, and she got upset at my boyfriend and his mom for "making up" stuff, so she called them. She got in an argument with his mom and even insulted my boyfriend, to his own mother. She hasn't talked to me since, and I haven't talked back. I always clean up after myself, help her with her job, and I do my own laundry. Basically, I'm self sufficient. I don't ask for money. Yet she complains all the time. I have good grades and I am a National Honor Society member. I don't do drugs, never have never will. She knows all this, yet she's continuing this. Am I in the wrong for standing up for myself? Background: One time both our moms talked and I found out from my boyfriend's mom that my mom said she was going to do whatever it took to convert me. (She told me she started going to church more often for "self" reasons) I brought this up while my mom and I were having dinner, calmly, and she denied it and also got upset at my boyfriends mom. Yet, my boyfriend's mom swears she knows what my mom told her and that she will never turn her back on me. So I feel like a stranger in my own home. My mom lies to my face about accepting me for who I am, and now she's trying to make up ordeals so that I stumble. I already have enough stress, it being Senior year and preparing for college and saying goodbye. I don't need all this commotion. What should I do? Thank you for helping :)