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The crash itself was a wake up call for Leo, but Leo is still not ready to admit it. The crash wasn't deadly but it came about because Leo refuses to grow up. He's not taking responsibility for his own well being, physically or psychologically, because he has been so reliant on JJ. Now JJ is not in the clear because he did not communicate all his feelings, leading to Leo continuing like nothing was wrong, but JJ is right when he called out Leo on not being 19 anymore but still acting the same. Leo is a grown ass adult, he should be able to rely on himself, especially as a professional in his field. He let himself go, continued clubbing, let his ego win over reasoning, leading to his crash. He was lucky nothing serious happened but he put blame on having lost JJ (his fortuna) rather than his own lack of self-care and self-control. He's gonna receive another wake up call from JJ however.
I believe in his conversation with JJ, Leo will express regret and try to artificially repair their relationship. He may even call JJ his fortuna and outright state why he wants to get back together, which WILL anger JJ. So far JJ has wanted distance from Leo, not because he loves him less or bc he got a better offer somewhere else, but because he wants Leo and him to have a better relationship by being able to grow as individuals in a relationship. So far it seems Leo gets more out of the relationship than JJ, we see it in the first chapter where Leo has sex with JJ but only receives his own gratification and leaves JJ on his own (High and dry). JJ also strangely seems to not be completely bothered by the idea of Leo sleeping with others, and while I assume it may have come from a misunderstanding it seems that JJ doesn't believe that Leo really loves him. JJ may believe that their relationship is more transactional than it truly is, and that's why he questions if Leo has ever seen him as his boyfriend. Thus, Leo coming to talk to JJ about JJ being his fortuna (rather than someone he loves) may cement the idea that Leo does not see their relationship like JJ does. Ultimately, JJ might leave and Leo will have to make a decision - his ego or his relationship.