I was this person same sex relationship.
Years of little changes, not being able to talk to family without passive agressive comments, silent treatment, not allowed to spend time with friends because I was obviously after more and she was insecure, I needed to contribute more money each month, needed to pay for trips and things to prove my love and loyalty. Pick pick pick at every part of me that was strong, she was a bully.
But we had a great time, when it was good it was amazing, I hid in the happy times when I felt loved and everything was an adventure and exciting but those times were becoming fewer and further between.
It happened over time and I didnt know it was happening until I realised how unhappy I was and started to notice what I had lost. I was on egg shells all the time.
I should have left then when I knew I was unhappy and lonely but I was convinced it wasnt her fault and of course I could make it all better.
When I tried to take back control and pushed back trying to reconnect with people, she became agressive and then obvious emotional and physical abuse started but I was financially trapped, I thought I could change things, I was blaming myself and her history and not holding her accountable. I had no friends left and no confidence. This lasted for years! I finally snapped and ended it when she blew up one day, I just walked out and never spoke to her again. I went back to the house when I knew she was at work and moved all my things out and had to start again with nothing.
It had taken a decade to go from happy, to sad, to scared and hurt mentally and physically. The physical heals, the mental is still with me 11 years later.
I am now married to my DW who loves the bones of me, supports me constantly and builds me up every step. She has to hold me together sometimes when my past relationship rears its head in my mind. We never quarrel and work as a team. Life is good again
Walk away while you can. It is not your fault, she can control how she treats you but she cannot control you. You are being abused dont wait for it too become worse.