My heart hurts.

I know we needed to end things. We're total no contact right now, and I think that's the best option. He's already created an online dating profile. We only decided to separate 10 days ago. I read his profile on the site. He's very obviously trying to replace me with someone new. He's been my life for the last 8 years. I can't eat, and I still go to the gym every day because it's the only thing that makes me feel normal. Getting through my classes is so hard. I was crying in the middle of patent law the other day. My chest literally hurts, just a constant ache. I cry over everything. I'm doing the stuff I'm supposed to: I'm journaling about every other day, as I said above, I'm maintaining my normal schedule of going to the gym every day, I'm going to my classes, I'm spending time with friends. None of it seems to dull this pain. I don't know how to keep doing this.