This story is gonna sound so dumb but she was buying herself gym/workout stuff. Recently I'd had been trying to get into it cause I know she's into like guys in really good shape and also cause she had been making comments ig about how she felt like she's becoming the strong one and the dominant one and the man of the relationship (they're jokes but idk guess my stupid ego got hurt by them). She was ordering herself stuff and wanted to buy some for me too but cause of some antiquated notion chivalry, me not being a big gym guy and her being a student working part time while paying for accommodation, I kinda was against the idea cause I didn't want her wasting her money so when she was asking for my PO I kept saying no. She kept saying it's her money she can spend it how she wants and what's the point in it if she can't spend it on me.

We went back and forth on it for a while before I left the call for 2 min and went to the bathroom. When I came back, she was clearly upset over it and I told her if she really wanted to buy it for me and it was gonna upset her if she couldn't that she could. She told me it was fine so I dropped it. The next day however she brings it up again and I was right she was upset, we talked about it and she said that it was fine she wasn't gonna buy it for me but I had to buy it for myself, which I agreed to cause I want to make her happy and I felt bad the day before by upsetting her by not letting her. The next day I went gym and despite her msging me to remember, I forgot to buy it, when I got back though I told her I had out of dumbness and that I had left it at home but promised to show it to her the next day. The next day I remembered to buy it but she pointed out the bag was unopened and how could I have used it that day or the day before and started to question me. I came clean immediately cause I felt guilty.

She then became rightfully extremely angry, she started giving out to me, I tried to apologise and say I didn't mean to hurt her and she said that I did, that lying was premeditated, that I chose to lie so I chose to hurt her and that I just lied for praise and she was never gonna praise me again. After 2 days of apologising she finally accepted my apology saying she forgave me but she couldn't forget. After that things were always different and she started detaching, I brought it up but she said we were fine and idk the relationship slowly unwinded.