I'd read it in the same general direction as WF.
43 talks about decisively separating yourself from something and going your own way. 57 talks about penetrating the foundations of things, getting to the bottom of things, finding out where stuff is coming from. So the Yi is saying either:
1 There's nothing going on between you and him despite the crush. You're actually quite separate and he's not the romantic issue you're projecting onto him. Check out the unconscious assumptions at work here, and you'll understand both yourself and the situation better.
2 You should separate yourself decisively from this romantic notion you've got. Get to the bottom of it - why are you projecting inappropriate feelings on him? You want a sweetheart, sure - that's normal - but why *him* when he's not the right one? (Actually, I don't believe in *the* right one; I believe in *a* right one. It's not that difficult to find *a* right one for yourself, but you have to clear your attitudes and perceptions of illusions first. And the Yi seems to be suggesting that illusion's at work here in the case of your crush on the guy.)
Blessings on your harey lotus feet