My gf only relapses after I do, and usually it’s similar to mine

My gf had told me for three years that I wasn’t triggering, but she told me the truth and said I was. My relapses and mental health are triggering for her and she ‘only relapses after you (i) do’ She has started cutting in places that I have and used to and when I asked about it she got defensive. She never cut in the way I do and has even made harsh comments about it towards me before

How do I approach this :(