Situationship wants to stay friends after going back to ex

I’m a 22 year old guy and I’ve been seeing this girl (22) for about 2 months. One night we were drinking and we kissed. I had fun but she had mentioned she didn’t want anything serious. So that didn’t rub me right so I decided to stay away. A few days go by and our mutual friend tells me that they had intentionally set up bringing her around so that she could get with me and give her a chance. So I decided why not, I’ll give her a chance. She begins texting me more often and I reciprocated. Then she tells me before we met she had a really bad breakup with her ex a few months before meeting me. This just rubbed me the wrong way and we should be friends and she should go heal (reasonable answer ngl). She agrees and we stop talking for a week. Then I run into her at a party and she’s being touchy and I can tell she’s drunk. I made small talk and decided to leave with friends and go to a different party. She begins calling me about nonsense( I’m assuming she just wants me to come over). I ignore it and continue doing me because I know how this ends. That day forward we begin texting again and as I hangout with her more, I began liking her (smh). More time goes by and while we’re fucking she starts crying about how kind I am and how badly she’s treated me and how she feels bad about herself because she enjoyed fucking me. I was like wtf mentally, just disgusted lowkey. My ex was crazy but I don’t just trauma dump women (smh). I had so many bad thoughts but never told her and moved on. Fast forward to today she calls me apologizing saying she had been texting her ex a few days ago and they’ll be trying again. I agreed on beings friends to try and not hurt her feelings. I’m not sad or jealous but I am disgusted. I’m thinking about just blocking her but can’t since we work together. Any thoughts?