This isn't empty regret -- the company made a move that I didn't expect.From its spinoff from eBay in 2015 to April of this year, I was a boring buy-and-hold investor of PayPal Holdings (PYPL -1.47%) -- I acquired my position in 2015 and then I never bought or sold a single share for nearly 10 years. However, I finally sold my PayPal position because I believed that there were better opportunities elsewhere.It took roughly one month for me to start second-guessing my decision to sell PayPal. On one hand, I ...