Am I crazy? Why am I still not over my ex?

My ex and I dated for about 3 years, and we were talking about getting married and all. I broke up with him after he was being insensitive to me after having a miscarriage. Fast forward to about 7 months later, we had gotten back in contact and decided to be friends before pursuing anything further. He told me that he had met some girl and was interested in her but still hung out with me a couple times and even slept with me once before we got into an argument and haven't really spoken since. This was last May. During the argument, he genuinely looked hurt by some of the things I said even though I didn't mean most of it, I was just very frustrated. I haven't really tried reaching out, just told him that I missed him back in October but he didn't respond. He never blocked my number though and still has me added on steam and discord. (which I know he didn't forget about since it tells you when others are online)

Am I crazy? Why am I still not over my ex?
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