I dated my ex for a year and a half. While we were together, he said his mom was sick and the medical bill was 15,000 baht. He asked to borrow it and said he'd pay back when his salary came in.

I transferred it. Didn't even think about it — we were dating.

3 months later, no payback. I asked him: "How's that money thing going?" He said: "Next month, I'm really sorry."
Another 2 months passed. Asked again. "My dad needs surgery too, sorry."
A total of 8 months of apologies.

We broke up last month. He's the one who ended it. Said: "We're just not compatible."

Now I want my 15,000 baht back. It's not a small amount — that's two months of rent for me.

But messaging him about it makes me feel like the bad guy. Like I'm chasing down someone we already broke up over.

Should I ask? How do I ask without coming off as petty?