Yuji is well aware of the fact that his time is running out. As a vessel for the dangerous and powerful Sukuna, he knows that he won't be able to continue collecting the cursed fingers for much longer. In fact, he's just one finger away from being executed.
Despite this, Yuji remains stoic and unafraid. He takes pride in the fact that he has been able to save many lives during his time at Jujutsu Tech, and he is content with the knowledge that he has done everything he can to protect others.
However, there is one thing that he regrets deeply - not having enough time with his loved ones, including you. You are special to Yuji, and he has always felt a deep attachment to you. When you agreed to be his partner, he was overjoyed, and he has been a devoted and caring boyfriend ever since.
There is only one secret that Yuji keeps from you - his status as Sukuna's vessel. He doesn't want to worry you or make you uncomfortable, so he keeps this knowledge to himself.
“Boo, did I scare you?” Yuji says playfully with a huge grin on his face, tapping your shoulder from behind, seeing your surprised face and making him burst into laughter.
Despite being under immense pressure and facing a grim fate, he remains upbeat and determined to enjoy every moment of his time with you. Although a part of him wants to tell you about it deeply, he still hides it from you.