Can I get advice please?

i_am_tbjxii
My mom has Scizoaffective disorder she been having episodes for a long time. She had episodes once or twice per year from 2012-2021. During these episodes she goes missing for hours, doesn’t talk, act very strange. She took her meds for three years no episodes I would take her to get the injections. She goes through these phases where she feels she doesn’t need medicine and it’s very frustrating. She never accepts she has a problem and things I put her in a mental institution it’s really frustrating because I feel I took on the responsibility as the eldest son. I have a brother he is in college in another state but I feel I’m on my own when comes to these matters with my mom. I’ve come to the reality my mom will never get better and I won’t be able to live not worrying about her. I have a fiancee and she is wondering if I’ll be able to leave my mom eventually. She is putting me in a tough position. If I’m too far from my mom what will happen? I feel she is subconsciously having me chose my mom or her and I’m getting annoyed by it. I want to live my life but I’ll feel terrible if something happen with my mom.
Can I get advice please?
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