My boyfriend and his mother

So I’m 22, my bf is 21.We are both living with our parents but planning to move out.We are both medical students.His mother is extremely ambitious which is fine but sometimes she crosses the line.Every two weeks they are fighting about his grades in university.He is working night shifts because she wants cause she says that it will be good for him.But she also wants for him to only have good grades.Since Monday evening my bf is acting strange.He is kinda avoiding me,not wanting to talk, we are seeing each other but I can feel that there is something going on.Last night I saw on location that he went out and called him and he was very angry.He told me just to leave him alone, that he hates everybody and just wants to disappear.I asked if the problem is with our relationship and he said no and just to leave him alone for a while.So I didn’t text him the whole night and decided to call him today in the afternoon and he invited me to his place.I went there and his mom saw me at the door(she likes me btw) and started nagging about how irresponsible he is, how he has so much potential but is lazy, childish etc.I told her that I don’t think so and ofc defended my bf.We spend some time together and then I left and he barely kissed me, he didn’t said I love you which is not typical for him usually he is very affectionate.When I got home I called him and told him that I just don’t feel good, don’t feel appreciated, I feel like he is avoiding me and he told me to calm down and that this has nothing to do with me and us.He just doesn’t feel good in this period and just feel like in a hole.I think that maybe his mom is super annoying,always nagging, fighting, screaming and unstable and this makes him feel not enough.I want to help him, how?Do you think that the only problem is with his mom or maybe he just doesn’t want to be with me and avoiding me idc.I want to help but I am always overthinking I idk