Yeah, I thought of that too, Moose. Actually, my bigger regret is spending a very large chunk of money on the down payment for our house and furniture to fill it. Sure, we settled and I got some money back, but nowhere near what I put into it, and she's in the house. It's going to be a long time (if ever) that I can afford to buy a house again (much less find someone to share it with!).
I feel pretty foolish about that.
I don't know if I'd qualify that as a dumb purchase - either the ring or the house. Wouldn't you say that at the time it was the right thing to do, and only in hindsight, after the relationship soured, did your view of it change. I think that's more a change of opinion of the relationship, than something you bought for or with your partner. At least in my case.
My ex has our old house (paid for with my downpayment money), and pretty much all of our furniture (some of which is antique, and some very nice persian carpets we got in Europe) that we bought together. But I feel more regret that the relationship didn't work out, than upset about anything we bought when we were together. And even then, the regret is more because of the hurt that it caused (and probably continues to cause) my children, than anything it's done to me or the ex.
Yes, you're right, it was the right thing to do at the time, and my biggest regret is about the failure of the relationship (thankfully we had no children). Although now that I'm looking back with a bit more objectivity I can see more clearly where things were going south.
It was a VERY expensive life lesson though! And it's left me very cautious (paranoid? cynical?) about doing anything like that in the future (if I'm ever again in a position to do so).
BTW, my apologies for the thread drift.