SEEw22 Corri is giving you good advice. If you don't understand her advice, please try to till it makes sense. She has BTDT on both ends of the sex drive scale and dealt with abuse.
And if your fiancée were here, I would ask her why she is sticking with you, taking such verbal abuse from you over sex (especially when she has sexual abuse in her past), OK Seew, I understand why you get PO'ed over the no sex or lack of sex but you doing so creates the "which came first, the chicken or the egg" problem that many people experience.
So what you need to do is read somewhat between the lines. Your honey is LD, you don't like her LD, you don't treat her right, and she backs away from the R.
What people are saying to the abuse/resentment thing is "you need to back off your resentment any degree/form of disrespect and do what people are telling you, which might include moving on.
If she liked sex at one time and now it is not important to her now, you can't make her like it the way she did in the past.
Maybe sex for her was like the first time I had vanilla Coke. Really good but it's appeal wore off fast.
Could someone force me to like vanilla Coke again? I don't think so.
No we don't know the whole situation. We know from experience what is likely to come next.
RHW admits to not getting the sex part men and women need in a M till her H wanted a D.
I bet if RHW didn't have kids, she wouldn't have tried so hard to stay M.
BTW, RHW got it. Some SO's don't get it and guess what? Most muddle through many years of being sex starved and married to their LD partner.
The ones that D, look at the additional mess that involves. Most people here on the SSM forum want you to avoid the pit-falls up front. That is why they give the advice they do.
People come to the SSM forum looking too fix their R. It is better to fix yourself and almost forget about your SO. If you get healthier and your SO wants to be in a R with you, you both feel fulfilled, great. If not, then you are doing yourself and her a dis-service by not getting the beginning of a LTR more on track and up to speed.
I think some of those resources will help you see some things you might improve in yourself and help you understand sometimes being nice or attached to someone can be not as healthy as one would think. I know I had issues that needed to be addressed.