Mother issues.

Hi mums so I'm having a dilemma at the moment with my mother.
I recently just started a relationship with a man who I have been friends with a very long time who my mother doesn't really know but she has a thing in her head that all men are a*%holes cause she has always picked the wrong men.( my first relationship in 3 years and since I had my son) anyway mum and I We rent together. Every time I have gotten into a relationship (even before I had my son and we lived together) or my social life is going well (don't have much of one) she always hates my friends or I'm happy my mum gets kind of mad at me.. She makes out as if it's other things that piss her off and just causes trouble out of no where or doesn't talk to me to the point iv completely avoided even telling her anything about us and that we are together even tho it's probably obvious as we spend even moment we can together. But all of a sudden the last week or so, things have been tense it's been like walking on egg shells and I get home a bit later in time for my sons bed time and I go straight to my room to avoid her.. It's at the point yet again I can't stand being around her cause I'm worried she will start something so I completely avoid her. I know she worries that me being in a relationship will take me away from living with her which iv told her heaps of times I wouldn't do that and leave her with a house she couldn't afford on her own. But this becoming a joke.. My mum has always been in bad relationships which I have learnt from her mistakes and am a great judge of character and also I'm a hell of a lot more strong willed than her and won't put up with other people's crap or would never ever put a man before my son (unlike my mother) so I don't understand what her problem is? Iv always been the one to help pick her back up also. Iv spoken a lot to my psychologist about her as I have a lot of issues relating to her but I can't fix her, iv acted a lot of times like a mother to her and can be more mature at times and I get very anxious and jump through hoops when she is even the slightest bit annoyed with me and I don't know why, she's judgemental and selfish but also stubborn so that doesn't help. I can't talk to her about anything, she blabs to the whole family and has a say on everything. She puts me down in front of people. She's very negative and her problems are always worse.. But I want so very badly to have my feelings heard by her and to have a good relationship with her and not have this conflict with her. I don't even know what I'm asking really... Feels good to get it off my chest. Do I try include her more even tho I know she will be rude and try embarass me or hate my partner more or what do I do? Is it jealousy? Or am I problem too that I'm not seeing?
Things were going so well with us the last few years cause I was a bit of a loner and just was being a mum and it was just her and I with my son, but now I'm living a happy good life it's all turning to poo with her. :'( can't win..