Guy's Behavior

Why does he remember things about me from 30 years ago?

I met this man 30 years ago when we were in our twenties. He recently got divorced and looked me up on Facebook and sent me a friend request. I accepted it, but he did not message me. So I messaged him a few months later. We messaged back and forth for a couple of days and then he wanted to meet in person, so we did. He talked again about our two meetings 30 years earlier. He also said that we could start something but after the holidays. He told me that he has cancer which was a shock, but I didn't care. Now we're texting, but I am the one initiating, but he does respond and we can text back and forth for hours. We didn't communicate over the holidays, like we planned to, due to his ex-wife meddling in his private life, he told me this. He is almost done with his treatments, but I am confused as to why he doesn't initiate contact. Is he no longer interested, or is it due to the stress he is dealing with concerning his cancer treatments? '

Updates
+1 y
I do want to add one more thing. When we met a few weeks ago, he wanted me to know that if anyone told me that he and his ex were getting back together, that I was not to believe it. He said that would never happen.
Why does he remember things about me from 30 years ago?
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