especially if it’s in someone’s back
It’s been done, at least for relatively loose definitions of “caltrops” (loose enough to include tacks/small nails). Mick Foley did it in one of his infamous Hell in the Cell matches…I think the one with Undertaker. Probably did it in ECW or Japan, too. Other “hardcore” promotions have done similar stuff…
And what you say in the OP is right, Antinor01. Time is a necessary component of the healing process, but time won’t heal things on its own.
By that logic murder heals all wounds… if you do it enough. 
Amen.
Hmm. I could see that not as the re-opening of an old wound but as possibly brushing up against a newer one. The old wound of being angry or hurt because he was a jerk and the relationship ended could be very different from a more current (but hidden?) wound of wishing that you’d been able to have a long, successful marriage in this life.
Don’t mind me, I’m just musing out loud . . .
Well, a bit of both really, I’ve never been the type to be friends with an ex (but then, I only have 2) so this whole talking thing is new to me. It was a bad breakup and we’ve never really had a decent closure. He’s taken a ‘the past is the past’ approach for the most part.
And it’s not like I haven’t moved on, I’ve been with someone 13 years now. So it’s not like I would even be trying to rekindle anything, but thinking about what could have been was harder to deal with than I thought. At least I have something new to talk to my therapist about. 
About a month ago, something reminded me of a place significant to our family from my (very long ago) childhood. Unlike most such places, I hadn’t gone to Google maps and streetviewed it. So I did.
Big mistake. It just brought up a ton of bad memories that haunted me for days.
Technology: Making the re-opening of old wounds so much easier.