What if Trump stands, wins nomination but then loses?

So many things are hanging on whether Donald Trump stands for the presidency again or not. There are a number of big IFs and then an even bigger WHAT. If he decides to stand, will a lot of other Republican presidential hopefuls stand against him for the nomination? If he stands and wins the nomination, will he have a better chance at winning the election than he did in 2020? If he wins the nomination but loses to Biden or whoever is lined up against him in 2024 WHAT then? Will Trump go mad and do what he tried to do in 2020/2021 and refuse to accept the result and get his supporters to launch an insurrection? All in all there must surely be enough huge question marks for the Republican party to contemplate and to begin the process of trying to persuade Trump not to stand. With all the devastating stuff coming out of the January 6 committee hearings about the way the former president behaved prior to and during the assault on the Capitol, even Trump must be having tiny doubts about whether he would be guaranteed to win the White House again. There are also very dramatic signs that cannot be avoided if you are in the Trump camp. Fox News, always a big fan of Trump, has now taken against him. That's huge. Trump it seems has lost his biggest media backer. Fox now seems to be promoting Ron DeSantis, the governor of Florida who has yet to declare his interest in seeking the nomination for president in 2024. My assessment is that Trump wants to stand, he feels it is his right to stand, he is convinced he is the best candidate, he can't even consider the possibility that he would lose to Biden or whoever BUT he will be having niggling doubts. He will not be able to cope with the thought of losing and if enough people from the Republican party start whispering in his ear that they love him but please don't stand, he might, just might make the biggest decision of his life and NOT stand again. This possibility I believe is now more likely than ever before. I never thought I would write this.