HI
I'm on agreeance with your not wanting to think it means heartbreak/ache as most do interpret it that way. I think to a degree it depends on the context too as is subjective as most of the cards are. In my book, which I tend to refer to most when I question meanings, Lovers' Tarot, it says to take a good look at the card (it is based on the rider-waite images) as "the swords pierce a cartoon heart, there is no blood. The clouds, becoming lighter, indicate a change for the better. This is false heartbreak". How I interpret this and have adopted this approach, is that it is knowledge or reason (swords) penetrating the heart (our emotions, our values, etc). Most often it has come up for me when reading when we 'grow' in our thoughts. For example we get older and realize what our parents/society/school told us was the 'watered-down' or child-safe version or even just what they wanted us to know of THEIR truth or a truth. The heartbreak isn't literally that someone is going to hurt you, but rather the idea of learning the adult version of a truth. I've seen it most often for those who didn't believe in tarot, psy abilities or 'hidden' things and were trying to get their mind around how they knew another's passed over loved ones personality and how they interacted with them. So to me because it's in the swords category I don't tend to assign the weight to the emotional aspect of it... I leave that to the 5 and 8 of cups... (altho the 5 doesn't quite seem to totally say that either).
So now that I've blabbed your 'eyes' off hehe, I think in reference to your question, and it also, I think would depend on the other cards around it, that (using what I've said as an example) that someone will 'grow-up' in regards to thier feelings to you. With my example in mind, what comes up to say is that there is a difference now to "I hate you" or being mean to someone on the play ground and now the realization is geez was I not liking this person cause we were alike, cause deep down I liked them, or cause I just didn't understand them etc... At some point we come to the truth of why we feel the way we really do, if we really feel that way, and some times we come to the understanding that it's just a waist of energy to go on hating or being mean.
sigh in short the person is going to change in how they act/react to you. With the druidcraft as I'm not familiar with it, I do like your interp better as to me the heartbreak idea doesn't seem to fit...