I'm hoping somebody might have an idea for an ending to a sci-fi novel I'm wanting to write. It's a time travel novel written from the standpoint of the person in the era visited. The story is that he is visited by scientists from the future who tell him that he and the girl he is dating will marry. He will become a great scientist, but his son will out strip his work, but his grandson does even more, developing time travel, which is used as a weapon, changing the past to change the future, leaving humanity with no history. The end result is that the man visited has to leave the field of science and remain celibate to prevent the development of time travel. The man agrees, ending his relationship with his girlfriend and going into another field altogether, deciding to remain alone romantically. Does anybody have any thoughts on how to end this? Thanks.