Really like your car but then all of a sudden you want to swap for another

My dad sells his cars pretty often. Had his 65 fastback mustang 2 years and sold it for a 60 f100. Missed going fast so he got a 68 fastback mustang, missed cruising so he got a cheap 66 f100, sold that and now he wants a old tbird. He kept all the cars a while so I wouldn't call it flipping and he always made money. If you really want another car then be smart about selling the one you have.