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So after the incident I went silent. She contacts me after a while, asking what's wrong. I said we're not meant to be together and that I'd rather see she didn't contact me at all. She kept messaging me through different channels that she does not want to lose me, that she's sorry for not being a good girlfriend but that she understands me, that she didn't give enough back etc. She's on SSRI antidepressants and has suicidal thoughts and I'm the only one that can keep her from depression and anxiety. That is actually true and she is extremely emotional and has anxiety problems.

She never mentioned sleeping with a guy. I just kept ignoring or replied with short "fuck off" messages. After a while I got fed up and just sent a picture of her messages from facebook with the guy she's been cheating with. She replies with: "Oh, I thought you just read it, now I see you actually took a picture." "Does my brother know?" I said I don't have time for drama and spreading gossip, so just chill and let me alone.

Few days pass, then she sends me this long emotional email, where she said she didn't have sex, but just kissed a guy. That she had to try this, because she felt there was something missing between us. That the guy wanted her to grab his dick, but she refused. But now she realized what she's done, is ashamed and that her anxiety just got worse and is thinking about suicide. I replied to not fucking blackmail me with suicide (but I do know she does suffer anxiety and is not feeling well without me, so try to keep my frame in a joking, not angry tone ).

In the meantime I kept socializing, lifting and taking care of myself, which has helped me alot in the last few weeks. My emotions toward her have been decimated and I'm going to move on eventually.

Then yesterday she contacts me again. This is the exact conversation (translated from my lang):

HER: what's up?
I ignore the message for 5 hours
ME: nothing, honey
HER: Now you're going to make fun of me?
ME: Who's making fun?
HER: You, calling me honey.
ME: Do you feel like having sex?
HER: No.
ME: Why do you contact me then?
HER: So it's like this now?
ME: You have a birthday soon, dont you?
HER: I'm not THAT old yet. But yes.
(she's over the wall, but great looking for 30)
ME: Make a wish for a pillow with a big ear.
HER: Huh...
HER: OK I got it.
HER: You don't want to talk to me.
ME: I can charge you $50 an hour.
HER: Or a full body massage?
ME: Only if it comes with a blowjob.
HER: You'd have to teach me to give a proper one.
(I once joked she can't do it.)
ME: OK, but learning lessons don't count for conversation bonus.
HER: :) OK. What do I need to do to get my ass massaged?
(she loves it, I do to, she has a great ass, sex usually follows)
ME: Beer, cheeseburger, some piece of clothing... you've got many options.
ME: That was 1h. You owe me $50.
HER: When are you coming so I can pay you?
ME: Can't tomorrow, I'll see about Thursday.
HER: OK. Good night.
ME: tata

I don't think she really was riding the classic CC, she lost virginity pretty late and had just a couple of guys before hitting the wall. She's just very emotional and her anxiety is controlling her life. Emotionally I'm past her. I don't want to be in LTR with her, unless I feel like she's really emotionally invested in me and finds me attractive. But I do want the blowjobs and sex. She looks great and I don't have many other options in her league right now. Do I use her as plate? I could also use her as preselection chick that other see me around with. Is it to dangerous for me to develop oneitis again? I know I'm going to be shit tested as fuck right now. But I want to try and spin this in to a plate. Need good advice now what to avoid and good reading material for not developing oneitis and becoming friendzoned.

TL;DR Developed oneitis, found out she was cheating, dumped her, she wants back, I want to transform it to a plate.