Out Of My Comfort Zone But I'm Having Trouble Breaking It Off

I worked out every day before work. This girl about my age started working out during the same time slot. We showered together, she was a whole lot more casual about it than me. She stared me down, washing her kitty, her boobs. She caught me putting my bra on and told me it was a shame to have to hide my puppies. She sat on the bench drying her feet, her legs crossed showing her full womanhood. She took my brush out of my hand and insisted I let her comb my hair. She asked if I liked her rack, she told me it was all natural and I could touch if I didn't believe her. Day after day it was one thing or another, always pushing her tits or kitty on me. One of the trainers told me she was a dyke and she had told her she was going to get me in the sack.

So why did I wait for her, shower with her, stare at her tits, her kitty lips. Why did I sit there and let her see me naked, admire my rack, my kitty, my eyes. Let her touch me. I wasn't able to resist, I went out with her, and she took me straight to bed and I complied with everything she wanted to do. I know what happened but I don't understand what happened. I've been dating her for over a year, and I still don't understand why. I told myself I am going to stop seeing her, it's my 2021 resolution. But why do I feel so bad.