Here

It explores the link between bonding, sexuality, mating strategies and early life experiences and how they all intermix. I find factoring in all these variables is a much better way to evaluate female promiscuity if you want an LTR than assuming the cock carousal is the standard mode of operation.

Snippet from page 2 of what you definitely should already know;

Moreover, it has been argued (e.g., Lovejoy, 1981) that the bond partners form in romantic/love relationships is partly energized by sexual attraction/ behavior and ultimately comes from and serves sexual/reproductive ends.

If there wasn't already a good enough reason to improve yourself as a man well looks like if they don't find you attractive they won't feel anything emotionally for you either.