LESBIAN RELATIONSHIP ADVICE?

i've been with my girlfriend 2 years now and at first she was all cute and loving and romantic and for the past 8 months she's been distant and different, she's no longer romantic she talks to me like sh**t and we don't have sex anymore we're lucky if it's once in 2 months, i love her and i care about her but it's hurting me - we've spoke about it and she say's she has issues and she's gonna get help and gonna change but it always goes back to the aggressive person ... this is not the girl i met.. she has pinned me up by my throat a few times too in anger.. i need advice and help