My boyfriend’s mom is a nightmare

So my boyfriend and I have been together/living together for 2 years now and living with his mom for 2 years as well... I wouldn’t mind it as much if she would start fights with him all the time about drinking. I understand that she cares but we are 2 grown adults who both work full time jobs, pay half of all the bills and pay our own bills. We barley go out, maybe once a month if we’re lucky. And, every time we do its nothing but a huge fight trying to get out the door weather we’re going out drinking or just going to the mall or dinner. She always starts screaming, you better not drink, I’m going to lock you out so don’t even come home (again we are both grown adults btw I’m 25 and we pay for half the bills). Its not even when we go out that she starts fights, if we drink at home she starts screaming that we don’t need to drink its a waste of money and we better not be going out because she’ll kick us out. Im so sick and tired of living with her and its even causing fights between my boyfriend and I but, he doesn’t want to move out he actually wants to get a house with her! He says that he wants to save money so we can start a business and get a house if out own. But, i CAN NOT live with this woman for one more minute and Im afraid that once we move into a house with her its going to only make my boyfriend more comfortable living with her and we’re not going to be able to start a family and a life together. I want kids and so does he but i can’t even think if having on living with her. When i think of the possibility of getting pregnant, and i really want a baby, i think instantly think if adoption or even abortion.... She the type of person to want to do everything then throw it in your face so if i had a baby she would want to spend every second with it and then throw it in our face saying she raised it. We just got a kitten and shes already doing that with the kitten. She buys all these treats and when the kitten is in our room so bust in (no knocking because she never knocks, has even bust in while we were having SEX and didn’t seen to care) and when we tell her to get out she starts a fight saying how she does all this stuff for the kitten and she cant spend anytime with it when she has more time ti spend wit it then either of us! I just want to and get away from her! She is a nightmare to live with and if we don’t soon i might just leave myself. We talked about it all before but he still rather live with his mom and blow his money on 4 $600 sweaters (so far), Jordans almost every month, rims for his car and even getting a brand new Infiniti but, doesn’t want to start a life with just him and I. I don’t know what to do. I love him but i just can’t stand her. She’s driving a wedge between us