I need some serious advice. Please help.

Im gonna make this a long story short. My baby dad has always been toxic, manipulative, disrespectful, a gaslighter, a cheater, everything terrible and awful. Ive had to call the police many times because of him screaming, harassing me, breaking my things, ripping my work clothes. He never takes accountability. The list goes on. Hes broken my tv and blamed my 1 year old son for it. I could show him a screenshot of him messaging a girl to have sex, and he will still deny it til the day he dies. Its insane. Anyways, we do live together on a lease which ends soon, thank god. We cant afford to break it rn or anything so ya. Im keeping the peace for my sons sake who is turning 2 soon. And my feelings have been gone out the window for a looong time.

Well, his mom is in town visiting from out of state, and staying with us. and since then, he’s been mia. Its been ME putting him to nap and sleep every night. ME making all his meals, ME giving him a bath. Which i dont mind thats my baby. He leaves for work at 8am, and either comes back and showers and leaves for the night, or just doesnt come back at all. Hes been mostly gone since his mom has been here. His poor mom seems tired. Shes just been babysitting and he hasnt been spending time with her at all. Let alone being a parent AT ALL this week. Hes also a mamas boy, her english isnt very good and i dont bother explaining stuff to her i just stick to my business because she will believe everything he says. Even his sister who wants nothing to do with him said hes terrible and so is her mom. Me and his mom get along fine, but he makes up lies to her, so i dont really talk to her anymore at all even tho shes staying with us right now.

Okay also this is what i wanted to ask. He literally asked to PAY me to sleep with him because he was so desperate. While he is dating her!!! Even asked me out on a date the other day. Which i said leave me the fuck alone to. He will be Texting her goodnight i love you, then coming to me and telling me how much he wants to eat my pussy rubbing his dick and begging to fuck me. Im not perfect and im not going to lie here, we did have sex twice a few months ago. He even bought condoms and i have screenshots, proof, and everything. His girlfriend doesn’t even know we live together. He acts like he has his own place and probably lies to her about me as well. Well he hasn’t been here multiple nights in a row. Tonight is his day to watch my son, and now i cant do anything because i dont want to leave my son not sleeping yet with none of his parents here. I told him i dont mind messaging his girlfriend, and normally he would say dont please or deny everything on text. But rn he said he doesnt care anymore because im toxic and only care about myself. Which is not true! My life was peaceful before i met him. Im calm, quiet, very kindhearted. I so badly want to just message his girlfriend and call him out on his bullshit. That poor girl was me once, and i wish someone would have told me if there was a chance. Anyways what should i do 😅 my son is most important. And he clearly isnt here for him. And hasnt been. Idk ladies