How can a guy love a girl and but ignore her for days?

Life is weird. My ex and I had started talking again. I told him from the beginning that I wasn't looking to jump back into a relationship. He said ok like he respected it. ( no we're not hooking up) so he would call me a lot and we would long talks and just laugh. It was good. Then he started to tell he loves and misses me. And would ask me to give another shoot. I don't know when we together before it wasn't healthy. He said he's not the same guy anymore. And I need to quitting looking back at the past. I told him I didn't believe he loves me and misses me. He said he doesn't just say for fun. I don't know I haven't heard from in 2 days. He just stopped talking. Should I reach out? Or leave it be?

How can a guy love a girl and but ignore her for days?
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