I saw my first love's wedding photos on her KakaoTalk profile after getting rejected by my crush today

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It probably won't last long, but my mental state is completely shattered today..
Because of me, she didn't go to Kyung Hee University and went to Pusan National University instead so we could attend the same school, and she even waited for me while I was in the military.
She used to do my course registration for me every single time, and she'd always ask, "I'm going to marry you, so why don't you show some responsibility?"
As you guys know, back in the day, I was one of those guys who was obsessed with WoW: Burning Crusade, grinding Hyjal and Black Temple during peak hours. I neglected school because I was playing games like a total shut-in... ㅠ
Every time she said, "You're not taking responsibility for me," I'd just brush it off with a "Whatever~ I don't know~!!" and eventually, she dumped me.
And today, I also got rejected by my crush. She asked, "Are you sure you actually like me?" and I should have answered better in that moment.
I think that few seconds of silence was what did it.
Why do people leave even when you tell them you're a sincere and good person?
To give you a crude "proof" of my status, I've saved about 160 million KRW while working at an SME, and even when I used to post curses on Bullpen saying things felt "off,"
I was making 10 million KRW in profit every month through day trading stocks. While working at that SME, I studied for 9 months and passed the National Tax Service civil service exam this year.
I'm currently waiting for my official appointment, but today, my heart is truly breaking.