We were a harmonious couple who had dated for a long time, feeling like family and even considering marriage. We loved each other more than anyone else, but that was short-lived. The reason for our clashes was that while she was pretty and kind, she was also highly suspicious and had a habit of taking her anger out on me after hearing false rumors of me cheating. Her personality is ISFJ, which means she can be cold and detached when she sees a flaw.

[ISFJ characteristics include not standing out in others' eyes, but being cold and firm toward both strangers and friends.]

Our once-deep affection gradually faded, and our KakaoTalk exchanges became rare. Eventually, she messaged me first, saying, "Do you have a moment?" and we headed to a cafe. After 10 or 20 minutes of silence, she finally spoke. She asked to break up, and I agreed that we were both thinking the same thing. In an instant, the word 'marriage' vanished. Several months passed as we chose our separate paths. My ex-girlfriend is currently tasting the bitterness of life, quitting various part-time jobs on a whim and giving up easily. On the other hand, though my first steps were difficult and full of hardship, I endured with the sheer tenacity of effort and transformed from a struggling state into a tycoon.

While working at the company, a text message arrives from my ex-girlfriend. What could be the reason? After all that fighting...