Ex broke up with me twice, I saw him again after 3 months and reached out was that a mistake?

I (27F) was in a short but intense relationship with a guy (30M) who broke up with me twice over the same recurring issue between us. The first time, he ended things and I convinced him to stay because I really believed we could work through it. We got back together, things were good for a while, but eventually he broke up with me again for the same reason.

It’s now been about three months since the breakup. We’ve had no contact. Today, by coincidence, I crossed paths with him while we were both driving in opposite directions. I’m not even sure if he saw me, but I definitely saw him. It brought back a lot of emotions.

Afterward, I sent him a simple message: “Hey, we just crossed paths. I hope you’re doing well.”

He hasn’t replied.

I’m trying to understand what this means. Is silence usually a sign that someone has fully moved on, or could it just mean they don’t want to reopen communication even if they still care? Has anyone experienced something similar : running into an ex after months and reaching out, only to get no response?

I guess I’m just looking for outside perspectives because my emotions are very involved right now.