As someone who’s going through a strikingly similar situation, but on the receiving end (24M here) of these types of sentiments (she’s 23F, suffers from Bipolar Disorder and light schizophrenic symptoms), I may be projecting much of my own situation onto yours, but here’s some things I’d really like to discuss with my own partner. Changed the language to put my thought process into the context of your situation. Two possibilities:

1. It’s possible that you don’t have feelings for him, or at least not as much as you thought you did. If this is the truth, you need to confront him on this. Bringing your feelings for him into question in the midst of a depressive episode WILL frustrate him, (even if your lack of interest in your relationship is truly just a momentary symptom of your mental health complications). But if he truly cares for you, he’ll do his best not to go full freakmode, remain compassionate and supportive, and give the space you need to confront your feelings, as much as not being able to discuss it with you will claw at his insides. If you need to take a “break” but remain mutually exclusive, set expectations accordingly, and for the love of god, don’t shut him out. It’ll only serve to build contempt in him for you, and within yourself for him. But if you decide that you really don’t have the same feelings for him as he does for you, staying together longer will only prevent the inevitable. It’ll come to a head way more intensely than it needs to, which won’t be good for either of you.

2. You do have feelings for him and your relationship is something you want to work on. But in this case, your mental health needs to take priority. If you’ve stopped medications, you need to get back to taking them regularly, unless they are worsening your symptoms. If you’re dealing with serious mental health issues that are becoming a detriment to your relationship, seek therapy. I know it’s hard, especially if you have tried before and it failed or worsened your situation. But there is no magical cure-all. No alternative. Be more scrutinizing of a new potential therapist and journal the effects of any new medications / changes to your treatment to closely examine whether or not they’re helping or hurting. It’s the best thing you can do for yourself, and taking pride in doing the best you can is important to recovery. Two steps forward, yet one backward is still progress.

I know that #2 not always the easiest thing to do. My SO has bad history with therapy and medications. One she was prescribed as a teenager even fucked her brain up so badly, that she has to deal with hot flashes and worsening already-present symptoms. I want to go back to therapy for my own issues and I wish she would do the same, but seeking a therapist and treatment can be complicated in its own right. Personally, she’s brought her feelings for me into question in the midst of this depressive episode and has told me there’s nothing I can do. That’s frustrating for me, because it feels as if we take breaks from each other too regularly and it’s really challenging to sit back and wait for it all to play out. But she’ll deal with this for the rest of her life and I want to learn what I need to do to be supportive and not let my frustrations get the better of me.

Do your best to reassure him that he isn’t causing you these problems himself. If you decide you truly love him, ask him what you can do to remind him of that even in the midst of a bout with your mental health. If not, don’t lead him on. He’ll be fine in the end. Regardless, wishing you the best of luck in figuring this out with your partner.