My mums boyfriend treats her like crap

My mum and her boyfriend have been together for 4 years now, he moved in with us a year into their relationship.

Since being together, my mum has done nothing but cry and feel depressed. He doesn't pay her any attention and never bothers to take her out.

I can understand that money is tight for everyone and that bills come first but that's all he is obsessed about.

He works nights at Tesco and has Tuesday/Wednesday nights as his nights off. Those two days are the only proper time they could spend quality time together but all he would do is just go on his PC games all day until midnight and just not bother with her. Due to seeing my mum looking miserable and upset on the couch alone, I would tell him that she's upset and lonley, only then he would come down.

My mum goes all out of her way to getting him a card and gifts for Christmas, Valentines day and Birthday but he never bothers saying he doesn't have money and that bills are more important.

My mum works part time and all of their money put together goes on bills. They never spend quality time as a couple outside of the house. He's just not interested and would rather play his PC games.

It's always my mum making the effort with her appearance but he never does the same for her.

From my point of view, it's like he doesn't give a crap about spending time with her and that if he does it, it's because he feels "forced".

He calls her a sponger and a taker because she's upset that he isn't bothering with her birthday for the fourth year they have been together. She was recently upset over the fact he's not making an effort to buy her a birthday card and gift and all he could say is "Just because you're not getting your own way".

Some of the nights he has had off, she has gone to bed fed up and he doesn't even convince her to stay down and spend time with him. He would rather watch a film alone.

Even when my mum had a miscarriage, she was crying and all he could do was go on his PC game and laugh while he was playing.

I don't know what to do about the situation but he's making her feel really low.