Baby depression

I’m recently out of a relationship. Almost 2 months ago my boyfriend and I broke up. We’d been together for 4 years and were planning to have kids. I know it sounds crazy but I feel so sad that we broke up because I was so invested mentally in this kid. I know I’m not a mom and I haven’t experienced the things a mom would but I can’t help but feel like I’m missing out or someone that was meant to exist will never exist now. I feel like I miss my unborn- not conceived child. I feel selfish for feeling this way because there are mothers who lose children that were actually born and I can’t compare myself to them, but I wanted to have his kids so badly and now that’s not a possibility anymore. It feels so weird to say that those things won’t happen anymore. Has anyone else ever felt this way?