I convinced my ex to cheat on her boyfriend

So my ex[21F] and I are really toxic and I mean REALLY toxic. Just to list some examples of how bad we are/were as a couple:

Her parents were super racist and hated me but she got into a heated argument with her dad about it. She then fucked me that night on the couch knowing her parents would hear us.

She cheated on me with a 45 year old man. I broke her phone when I found out (I’ve gotten better I swear)

I cheated on her with one of my younger sisters friends (after she graduated high school)

We had sex on a college campus bathroom after an argument about cheating on each other she went to class with my cum inside her.

And she slashed my tires because I joked about fucking her bsf(I did)

So after all that we stopped talking for a while and went our separate ways, we still followed each other so I saw she got a new boyfriend and was a little annoyed (I thought I wouldn’t be able to fuck her). My ex (calling her ex for privacy reasons) is a brownish Asian girl, nice round tits, short, and a whore.

During the middle portion of the year, after my roommates went to a party at a different college I tried to get a girl to come over but she denied so I called my ex up, we caught up a bit but she seemed kinda reserved and hung up. Later on while I was jerking off she called again,

“What the fuck do you want?” She asked me, I could tell she was very irritated, “I just wanted to say hi, see how you were doing, it’s been a while,”

“You just wanna fuck, I’m in a relationship, you know that!”

“When has that ever stopped you before? I know you miss it,”

“No I don’t,”

“You don’t miss our late nights? Why are you lying to yourself?”

After a few minutes of back and forth, she sighed and just sent me her location, “I’m at my boyfriend’s apartment, just wait outside and I’ll be down.”

I did just that, waiting for her to come down, she showed up with sweats on, an oversized hoodie and her curly hair in a bun, she got in my car and when I leaned in to kiss her she immediately kissed me and we started making out before she stopped, “Hurry up, before he gets up,” I nodded as I pulled into the street parking, she immediately took her hoodie off which I assumed was her boyfriends, throwing it in the back seat and straddling me as we started making out.

I started to massage her pussy and she started to do this kink I have, where she licks and kissed my neck, “Glad you remember,” I moaned out slightly, “Shut the fuck up,” she whispered as I pulled my cock out, she reached down and started stroking it slightly, “I bet your boyfriend can’t compare, huh?” She laughed and guided my cock into her tight pussy, she moaned so loud as she started jumping up and down, I had to lean the seat back so I could get more comfortable.

People walked past the car, I hoped they watched, “Fuck you,” she said as she kissed me, I grabbed her ass as she moaned, “I was supposed to be loyal, asshole,” she hated fucking me, I hated enjoying it, but we both knew it was hard for us to resist each other, “God I love the feeling of your pussy, I’m gonna cum!” I shouted as she got off my cock and put it in her mouth, taking my entire load inside her mouth and some of it on her face, she giggled a bit, licking some of it off, using her boyfriends hoodie to wipe it off, “You’re evil,” I admitted, she kissed me on the cheek, “Says the one fucking a woman in a relationship,” “She’s the one who agree,” “Whatever.”

While I drove her back we talked about our relationship and we both knew that an actual relationship between us was impossible as we both couldn’t stay committed to each other and liked fucking, so we became fwb (her boyfriend still has no clue.)