Cross-reference to that other post: Love sigils from 111 sigils of power and transformation
Sorry you didn’t get replies yet on that, I think there’s just no-one active right now who has used this book. I hadn’t heard of it myself, and it’s not so helpful to post a content-free “not me”. Hopefully it will gather replies over time. 
It’s quite common that after doing a love spell on someone they run. We have a lot of threads about the same problem on here, and it’s not the majority but frequent enough that it’s noticed as a significant risk.
The way I understand it is pretty much in agreement with your assessment here: they feel that energy, they intuit that it’s from you, but they subconsciously sense it as a predatory psychic attack. This is unfortunately correct - any attempt to dick with free will is a baneful attack, regardless of the well-meaning behind it. 
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So, they run away. Most of the time they don’t even know why, they just know that they feel bad, anxious or stressed and associate that with you (all symptoms of psychic attack), or decide you’re just not good for them.
We tend to call it “backfiring” around these parts, so using that in the search gets you a long list of all the ways love spells backfire. It’s arguably the hardest kind of working to pull off, partly because romantic relationships are so tied in to survival mechanisms, I think. I wouldn’t say the book is bad, or you did anything wrong, it’s just how this kind of magick plays out sometimes.
This post is typical:
A way around this for this situation, where attraction isn’t a problem, is to a) do a divination beforehand to look for where the blocks are and then b) do workings to remove those blocks, not directly on the target themselves.
Another adjustment is to add to the working some wiggle room with allowance for free will: If you include "if it be their will" then it’s no longer a forceful attack but an invitation, and that seems to help a lot.