To protect your lover's life, which would you sacrifice: "the past you've walked through together with your lover" or "your lover's feelings toward you"?

A strange letter came from my best friend. He asked me to come to his lover's place tomorrow and take him away even if I had to drag him by force. When I visited him the next day, he said he didn't know anything about a lover. ……While clutching his chest as if there were a hole in it. (Also published on AlphaPolice)