My ex finally came back after a year with someone else?normal?

We were together 4 years and it was amazing until the last year my aunt who is in place of my mum as my mum passed years back was diagnosed with cancer. I was down all the time and he was struggling at work and so it took a toll. He left me and didn't explain anything. I was devastated on top of everything he didn't even mention my aunt or ask how she was doing. Then after he broke up with me, less than a month later, she passed away. I posted her photo of me and her together and wrote a blurb he was on Facebook that same day and didn't send anything. The day of her funeral he posted photos of him visiting his brother in another state. He wrote a caption of greatest week ever and I know he saw that my grandmother passed.

So I withdrew and went off Facebook. Then found out he was dating someone else since 3 weeks after he broke up with me. So I was gutted and didn't write him. Then a year later I get a long fb message from him. I haven't used fb but read it. It was how he learned so much, made mistakes and that he never stopped wondering how I was and that we should talk. I looked at his page for the first time in a long time and all her photos were gone. I click on her profile and she's with another guy now. I called him and it was like he was him again and everything actually seemed fine. He asked if we could go out and meet up over lunch.

Is it normal