AITA for distancing from coworker after catching feelings?

I got really close with a coworker over the past few months. We talked all day, even after work during the night, sent each other songs, grabbed food, etc. I ended up catching feelings, but she has a boyfriend.

Recently her boyfriend moved back, and ever since then our dynamic changed a lot. We barely talk anymore, especially outside of work.

I realized staying close was messing with me mentally since I knew nothing could happen, so I pulled back and removed her from my socials to get space and stop seeing reminders.

We’re still civil at work, but I’m wondering if removing her makes me look petty, even though I feel like I just needed distance. I don’t know how she’ll take it either once she finds out.. I don’t want to hurt her but I needed to do it for myself.