I 20M have been with my gf 19M for about a year and a half. We have had an amazing relationship and I've never felt so strongly for anyone in my life. We share everything with each other and enjoy each other's company no matter what we are doing. We rarely ever have arguments and even when we do we are really good at communicating to resolve them without much issue. This has been the best relationship I've ever had and I love her. She has brought so much happiness to my life and we feel like we are on the same wavelength. I have felt as strongly as to say that I'd want to marry this girl someday when I feel more ready to support a family of my own. I am only a college student right now so it's not something I would want to rush and would just feel better to get married after I graduate.

One thing that has started to come up, though, is her mental health struggles, and it has started to overwhelm her and our relationship as a whole. She has become very withdrawn and noticeably distressed. She has definitely battled her mental health for most of this relationship, but it has never gotten as severe as it is right now. She tells me she loves me, but her actions tell the story of someone extremely overwhelmed with life and has needed to prioritize other things. We don't go out anymore, rarely have sex anymore, and pretty much never even see each other anymore even though we live close to each other. We have basically functioned as a couple in name only for weeks now. Our only connection has been texting and facetime. She has struggled in school and hates her job. I get the sense that she feels lost and has started to come to terms with the fact that she feels like she has no clear direction in life right now. It's almost as if she has pushed me away and seems like she is too overwhelmed to manage anything that makes a romantic relationship a romantic relationship. I think the stresses of her life, uncertainty about her future, and trauma from her past have all hit her at once to create a perfect storm of negativity in her life. It has significantly amplified her depression and pretty much caused us to put a pause on our relationship altogether. We are together and haven't had a talk about separating, but she had a breakdown the other day saying that she doesn't think she's good enough for me, she doesn't deserve me, and she knows she's hurting me with how she's acted. That was after I had brought up the fact that we haven't even seen each other once in the past three weeks. Her self esteem is on the floor right now. I'm trying so hard to be patient and to be there for her in any way I can. I want this to work because I love her and I know she loves me. I know that her being withdrawn is a product of her mental health and not that she doesn't want me. That's what makes this so hard, because I just want her to be okay and I want us to be okay. I want to see her smile again, hear her laugh that I love again, and to see her finally happy again. It just hurts to see her down so much and to see how disconnected we've slowly started to become as an unintentional result. In the past, she has said that seeing a therapist has "made things worse" so she isn't seeing one right now. I worry about her a lot because she's the best thing to ever happen to me and I don't know what to do. 

TLDR: Partner's mental health is worse than ever and is affecting our relationship significantly. I don't know what to do to help.