I dont like Hayato. Fucking his brothers boyfriend. I get that he has trauma but its kinda...

They're 2 people who equally love each other just the same. Just because one has a couple of baggage doesn't mean they're incapable of loving another person. If they broke up, it will crush one person and lead the other to destructive path. If they genuinely love each other, why not be together? If Hayato was half assing his relationship for Kazunari, I'd agree. They should have broken up. But his love was so genuine it broke him to think Kazunari might experience the same hurt he went through with his family.
Sometimes, being with someone we love (and loves us) gives us the courage to change ourselves for the better and walk the path our significant other is taking.
Granted, it can be done alone. But it would take a long time.
I would know. Took me 13 years and I'm still not completely "healed". Although I did learn how to love myself, because I spent a long time being alone, I find myself doubting every guy who've told me they love me. Because I'm healed in a sense, I now have a new baggage: being scared of being broken again. I spent so many years healing myself that I became afraid of the thought of loving someone who'd break me again.

If I had someone I genuinely love and vise versa, like Hayato, I'd also not want to break up. I feels better to be picked up after coming apart from one's insecurities than to do it alone. It's torture.

I get what you mean but I fully believe in love and heal yourself first before you get in any relationship. Because by doing so you are doing a favor for yourself and your future partner. Bringing unresolved baggage into a relationship can lead to unhealthy dynamics. When you don't love yourself you cant fully trust or love your partner.

Any relationship you get might end up where you are first and foremost unfairly relying on that other person to “make” you feel loved. Your happiness and emotional stability are entirely at the mercy of someone else.
You become sensitive and much more likely to take everything personally.

Therefore not tiring your partner. Its not their job to heal you.

Think of it this way your partner might feel obliged to always reassure you but you will always have this feeling of emptiness and when they don't feel like reassuring you it will start a fight. Isn't that exhausting?

Therefore tiring your partner*

I agree, but if the person I'm in love with says they want to carry my baggage with me, why would I turn it down?

Wow charity case. Kidding aside. Sure if they volunteer but it will eventually exhaust them.

I hope not tho.

I wanted to see something.

Me: "Hey... doesn't it worry you that my baggage might ruin things for us someday? I mean, emotional instability aside, my insecurities and ability to over think is no joke either.
What I'm asking is; what if you get tired of it one day?"

Him: "Well, i don't belueve i will. It is worth it for me in the end, because i will get to see you smile and laugh. And if i do achieve it, and i can support you, then i know that i will never be unhappy"

So, it might exhaust YOU, but other people are willing to go the distance for love.
And I'm not saying I'll comfortably stay as I am and not change. I will. I have to, for myself first and foremost. And for the people I hold dear to me. Leaning on someone for emotional support doesn't mean letting them carry any of my problems. At the end of the day, he just assures me I'm doing a good job with whatever hurdle I'm trying to overcome. I'm not making him do it for me.

I hope you heal with whatever you're going thru.