Broke up with ex about 8 months ago. I was her first (first boyfriend, first fuck).

Things went well between me and her, we were together for 2.5 years. We clicked well, she was actually smart and nice to talk to. Kinda short by my standards and had a pear-type body (her job was a desk job -> sat down alot -> cellulite on the thighs -> pear body). All in all I'll give her physique an adequate 6-7 (I loved her, I'm biased), and her character/ intelligence a 7-8 (compared to the rest of the women who seem to hover around 4-5). The sex was out of this world: spanking, blowjob in the dorm hallway, drunk and kinky touching under the table at a party, belting (my waist belt + her back/ butt = passionate "interaction"; also mild choking with hand/ belt; no safe words, I just had a knack for when to stop or on rare occasions she'd push me away and I'd know that I was getting too rough), anal, so on!

Main problem: possessive as fuck! (no need for details, you can guess them yourselves)

Eventually we break up, but due to the out of this world sex I kept in touch and demanded that we meet just for that. She agreed but only half-heartedly since she told me she loved me and wanted me back. Fast forward a few months and I realized that we're going nowhere so I bite my lip and tell her never to call me or contact me. She keeps pushing the envelope a bit (stockings, sexy lingerie, red wine) and it keeps reeling me in due to the combination with the sex.

I've had 25-26 girlfriends up to that point and to me she was a genuine unicorn (Not by your definition of unicorn but by mine: legitimately the best chick I met; not the greatest body, not the greatest mind, not the greatest character but she had enough pluses on those aspects). I've had logical discussions with her and I even discussed TRP with her. She openly agreed with it (you get what you want/ need/ deserve) but said that it's immoral as fuck and that "if everyone practices it then we won't evolve as a species". (was pretty impressed at this point since even my closest male friends are strongly against TRP). Anyhow, I see she has great potential in her but she's tied down to me. I tell her to cut contacting me. I decide to take this to the next level and get a new girlfriend. New girlfriend is hotter than her (7-8) but she's emptier (less to talk, not so strong connection, more of the "stock woman"). Who knows; maybe it's the fact that I'm still somehow tied to my ex?

I tell her of my new girl, she sends 2334324 texts about how I ruined her life, I feel like shit but I tell her that I don't care and I want her to move forward like I did.

Fast forward 1 month and she starts texting me again. I don't answer her, but for the past week I've been getting short beeps from an unknown number (probably her). I confront her and she says she doesn't know what I'm talking about. At this point my analysis of this behavior suggests that I can still bed her. I don't react.

Fast forward to the last 5 days where she texts me regarding her preparing for an important interview in my domain. I promised her I'd help her out if something like this turns up and I really want her to get the job: we text regarding job specifics, domain specifics, possible questions, etc. Based on the number of texts and the many "thank you very much for helping me" and "I'm sorry if I'm bothering you" I'm again convinced that the setting is there for more bedding. (point A, keep this in mind)

The new girlfriend was a virgin too and had only 3 boyfriends. I took care of the virginity recently but now her period is about to kick in -> 1 week of nothing. After this passes, her inexperience + our lack of time (we both work) means that progression towards more awesome sex will be slow. (point B)

Given point A and point B, I'm literally having butterflies in my stomach thinking about calling the ex and getting some crazy sex (taking virginity from current one felt like a labor, painful for her, unpleasing for me). So now I'm almost thinking with ma dick. What to do? I'm too biased and outcome-dependent to think. I wanna go for the lay with my ex.

Your take on the situation guys and your reasons for choosing the take please.