OMG I had a similar experience but with a very close friend who we later became a couple just like Yujin I felt used. He only dated me because “I was the only person who would never give up on him” or “try to understand him” but it was never love.. even when he told me the truth. I was selfish and ignored the fact that he didn’t love me. For him I was just a friend with the tittle “girlfriend “ cuz he wanted me to never leave him or replace him. . We are no longer together we are still good friends and it hurts to see him struggling and I feel guilty for not stay with him (as a “couple”) but I try to also prioritize my mental health and just a month ago i convinced him to take medication for MDD (major depression disorder) and he is taking them so I hope our relationship (as friends) can have a happy ending ╥﹏╥ you are strong for trying with him but sometimes you’re mental health is more important.
I understand that. I'm pretty greedy when it comes to loving someone and I overestimated my love for him that it will help him, ya know, the cliche "love conquers all" mindset. But, I learned the very hard way that, that's not the case and love can only flourish if two are willing to walk through it, I'm the only one salvaging our relationship that time giving up everything just for him to be, just okay, without thinking for myself and one day I woke up and realize that I'm losing everything to just prioritize loving him. If he's like Sekye who actually did also love me and willing to push himself to be better then maybe we had and I will give him more than 2 chances, even if he hurts me way too unimaginable. I'm willing to take it. But, he stuck himself on the loop unwilling to move or to do anything. So, even it if hurts us both so much, I let go. We cut contact. And even now, my love for him never disappeared and wishing him best in life and for him to be okay. But, I won't be his anchor or driver anymore

It's good to have happy ending but some are not that easy to have a happy ending. I'm so happy for the happy ending of them both because I never had that with my Ex. Our relationship ended far beyond repair. I relate to Yujin so much cause, I am quiet strong in emotional sense and I can handle others emotions, not saying I don't have baggage myself but it's something I can easily handle and I tried to lighten his load. Unfortunately that doesn't work well and it doesn't ended in a good note. So, seeing a good ending makes me so happy and somehow hopeful. I don't blame myself for letting him go but, I somehow regret that maybe if I did more and push more for him things go a different path, maybe a happy ending for us too. Hehe. But, that's the past. I'm in good self love now.