Oh @Former-Member. reading your post, feels like I'm reading a letter I wrote to myself 20 years ago. The details are slightly different, yet the emotions & thoughts you describe are so similar to my own experience back then.
Schizophrenia is a very challenging disorder for loved ones. As you mentioned, the affection & expression of love may not be consistent. As I also have my own mental health issues, & emotional needs, it can be incredibly difficult to deal with feelings of rejection. Sadly, this can be a symptom of the diagnosis.
I think within medical literature it is described as a Negative Symptom. Negative describes how it takes something away from the person. For example, an openness to always be warm & affectionate.
I became consumed by my friends health needs. I forgot about myself. I was hurt so many times.
I wish that back then, I could have had access to the sage advice @FloatingFeather has offered you.
The thing, I didn't realise back then, was that, if I wanted to help him, then I must be the best version of myself possible. Does that make sense?
I thought I needed to help him by focusing on him, & putting myself second.
I now know, (& am still learning), that if I want to help him - then I need to look after & nourish myself first.
Mental health diagnosis can be shocking & confronting to deal with. I was completely unprepared & didn't realise how easy it was to quickly become over extended. It can be so exhausting.
I can't say if this is right relationship for you, or if it has potential for longevity. As you are aware, the two of you are battling more than your share of odds.
Look after yourself. He survived before he met you. If things are meant to be, then they will, & in a good way. Without you having to sacrifice too much - including your sanity!!
I think the journal is a perfect idea x
Thankyou @FloatingFeather for writing an amazing response.
Wishing you the best @Former-Member