Seeking advice on dealing with my mother's actions

Assalamu alaikum everyone, I'm really conflicted and need some guidance. I've cut off contact with my mother, who isn't Muslim or even religious, while my father is, and I've never fully understood how that worked. I mostly lived with her, and she seemed supportive-she bought halal meat and even drove me to the mosque. But things changed when she started seeing this guy. He'd come over to cook, and I thought he was using our ingredients, but the food tasted different. Then I found out he was bringing his own stuff, including pork, when I was out with friends. When I confronted my mom, she admitted he'd used things like pork and wine, and she thought it was okay as long as I didn't know. I lost my temper, which I know wasn't right, and I've been staying with my dad for a month now, blocking my mom everywhere. Recently, my aunt told me my mom hasn't been doing well-she's smoking more and cut ties with the guy-but I'm still hurt. She lied to me and made me eat haram, all because she didn't want to inconvenience him, and I don't trust her anymore. My dad's encouraging me to talk to her, but I just don't feel ready. It's hard because I tolerated her drinking and smoking, and now this. Honestly, I'm not sure I ever want to see her again. What frustrates me most is how my parents and aunt are trying to guilt-trip me, reminding me of how she supported me in the past. But isn't that basic when you raise a child? She had me young, and my dad was focused on his studies early on, so she did take care of me, and I'm grateful, but that doesn't mean I owe her after she lied like this. Sorry for the long post, I just needed to share and hear some thoughts.