DD is 22.
She has been with her girlfriend on and off for 12 years. She has had other girlfriends in between.
It has always been slightly volitile- silly petty arguments of silly teenage/young adult things.
They have recently got their own place- her GF will argue with her and then kick her out. She’s come back several times covered in bruises and I think she has been self harming.
She has told me she isn’t happy but she’s her “comfort” blanket. Things will be OK for a couple of days and then it will kick off- she always has to be the centre of attention, if anyone is around them and DD pays attention to anyone else she will go off in a huff and then attack her.
I don’t know what to do. Any advice?