Yes, but that was your "baby" so long there may be seller's remorse later. I had that once. I sold an early model Colt Mustang .380 to buy the Glock 21 I eventually modified into the .460 Rowland. I'm glad I made the buy, but still miss having that little Colt around now and again just from all the memories carrying it over the years.
Yeah fair point, it was/is such a cracker of a gun. Faultless.
I think people read the word regret and think of it too generally; it's more miss it or wish I could shoot it again I suppose. The thing is, if I kept everything I ever had I'd not be able to get new stuff due to my need over want ethos, I don't see the point of amassing things for the sake of it, things have to have a purpose and there's little point (for me) to have multiple things that do the same thing. (Like you and your .380 Colt)