Rekindle a friendship even if it hurts?

Hey all. About 6 months ago I broke off a friendship because I was getting attached too quickly. We’d been friends for about a year and a half, and, unfortunately, we work together. I couldn’t really get over my feelings for her in spite of seeing her with other guys. I’m still struggling with it, but we’ve been interacting little by little with each other lately again, though I’m still apprehensive. The whole time we’ve been apart I’ve felt incredibly shitty for breaking it off in the first place. But I also don’t want to lose myself in feelings again. So I could use some help: Attempt to rekindle it, even if it results in more heartbreak? Or sit with this, feel like a jerk, and let what we had fade away because of feelings I’m not mature enough to get over?