Sounds like your income is disposable if a door ding is enough reason to trade in your new car for a another one. If a door ding on a 2 series breaks your heart this much, I can't imagine what a scratch on a new Ferrari must feel like lol.
Seriously though, It's whatever you feel like. If you feel that a most likely repairable door ding is enough to take a hit on depreciation and upgrade to a new car, then you do you. Sure you're taking a hit on your current car and spending even more money at this point, but at least you'll end up with a car that's a step up from your current one.
TO ALL THE CHICK MAGNET DOUBTERS: I've had about three girls come up to me before and told me my car looked "cute"