Caution.. adult themes below

Well this is all over.
I was not in a relationship with anyone.
She showed up this morning while Mom was in therapy. She had been there early and found an open closet we could use. We very much did.
Fast forward to this evening. I went to the gym. This woman there that I've had sex with before offered it again. There have never been and won't be names or numbers exchanged. We did, in the parking lot, in her car. After we got done, I went in to workout and go to my class. I got message on my way in and it was the woman this is about, saying she was coming to the gym. I didn't expect that.
The woman this is all about showed up late for yoga. She missed the class. After yoga, she met me in the parking lot and wanted to fool around a little. Busted. She smelled the other woman on me.
"I'll never date a slut! I don't want to be in a relationship with a cheater."
My reply was "but we're not in a relationship."
We aren't. We're just getting to know each other. We never said we were.
She just about ran over my foot as she sped off.
I know I messed up, but I didn't really at the same time. I had not made a commitment to anyone and I'll refuse to. She knew ahead of time I don't want a commitment.