Why do I think this way?

Backstory

When I first started RP I was still in college, I never dated anyone in my life and started applying RP knowledge on this one girl, we went out a few times but nothing happened (I was just starting out, practicing kino, eye contact, NLP, Push pull, conversational skills). She seemed to enjoy my company a lot, I was amazed how RP made interactions easier for me and her (besides having a date for the first fucking time in my life). Despite all this I never really felt anything for her nor reciprocated her, I was just practcing I guess, at that point she wanted a relationship.

I read on the Book of Pook how recovering betas with their newfound "powers" settle with the first relationship the can get and I didn't want that to be me, I put her in the friendzone on purpose, graduated and cut contact with her and everyone in my life and moved to a city.

Eventually she reached out to me and we started texting, one day a few months ago she confessed having a massive crush on me (that I was different, not like other guys, for some reason she was attracted to me since I didn't shower her with compliments,she has never done that before and couldn't explain why etc). I must admit I never really felt anything for her, yes, I enjoyed her company yes but with this new "knowledge" I knew I could do so much more, specially now that I graduated, so I focused on myself, dated other girls, again placed her on the friendzone.

What happened

These past few days she started texting me more often, initiating conversation and what not, she told me: "I get the feeling that you would be the perfect fwb" I decided to see how far I could push this and told her if she would be down for a fwb type of relationship (I did this all trying to train myself to see how far I could get out of my comfort zone, in reality I'm as beta as you get) she agreed, she told me

"I'm curious about what could've happened between us, I've always felt attracted to you, I've kinda beeing wanting this for a while now 1 year and 3 months exactly but I'm scared that if we go through with this I'll be removing one of the most amzing persons I've met from my life

How exactly am I part of her life, I wouldn't know.

I started texting her more sexual stuff just to see how far I could push her and to my surprise she reciprocated, she told me she just moved alone to a small apartment and basically invited me over to fuck

"I wouldn't mind being used" "It's just that I like sexual objectification" "I want to see one of your hands holding mine another holding my waist and your lips gently pressing on mine while you tell me "ask for it". I'm quoting here

Now here's the thing

To her I'm probably this guy who she probably wants to fuck for a while that also wants to fuck her.

In reality: (this is what goes through my mind and this is the shit I can't explain)

I really wouldn't like to fuck her (I mean I would like to she's hot, but..... for some reason I keep thinking I'm going to be taking advantage of her, and since I don't really feel the same way she does about me I wouldn't be honest and I'll be doing some harm in her life, "what if she catches feelings" what if she sees me one day with another girl, how would she feel? I'll be such a douche, this is not me, I shouldn't. She's a nice person, poor girl I'll ruin her life.

My inner self wants to actually call off the whole thing, text her that this is wrong that she doesn't deserve this, that I would be doing her more harm than good, that I'll ruin her life since I'll just use her for sex. She's actually a really nice person, you'll have bad karma.

And yet my other self says "Dude do you have any idea what this could to your confidence and any future interaction with women if you fuck her brains out? Who cares about the moral high ground you think any other guy would think it this much? It can't get any easier than this, tap that ass, and if you play your cards right you could actually plate this girl man"

I'm by no means an alpha dude, I'm just some beta guy trying to fake it til I make it (but she doesn't know this), and yet I can't explain why do I think this way, despite having all the evidence that this girl wants me badly,but I still feel nothing for her, I she would leave tomorrow I wouldn't really miss her.

All I want to know is if there's anyone here who could make some sense about why am I thinking this way. I actually believe I have to the the "right thing"