Questions: Girl's Behavior

So long story short, my mom knows a lady that’s hiring whom she happens to be friend with and works with and she was telling me she would help me out to try and get me in. Then an hour later when I was asking her for details and an address she started yelling at me and acting all mad for nothing! The she said she doesn’t want me screwing her over with her friend! She also says to me if I’m gonna know how to get to her friends office myself.

my boyfriend is a good guy and wants to get married but I need a steady job in order to do that to be able to afford house/ monthly bills…he an I have been together for 3 years now.

Another weird thing my mom did was ask in a pushy way for my boyfriend to move into my moms house with us (the 3 of us) and was trying to make him rent out his condo…he and I hve made it clear that we want our own place later on just the 2 of us..

so why does my mom act like this? Why does she offer to help and then start yelling at me and being all crazy towards me? Is she jealous of my relationship? Or does she fear me moving out?