He reached out to me after no contact for months, so why has he ignored me when I replied?

I met this guy on a tour group I went on in Australia and it was obvious he was interested in me and flirted with me a lot. Once I left the tour he text me almost instantly and we stayed in touch for a while but then he suddenly ghosted me. After a few months, he randomly messaged me saying he’d just been on holiday and decided he wanted to learn Italian and as I was such an expert, he wanted to know the best way to get started. I asked if he wanted some of my teaching materials and he said yes so I sent them to him but he’s left me on delivered for days. It was weird that we hadn’t spoken for so long and he wanted my help with languages, despite never being interested before. He always used to hype me up about my job and tell everyone about the languages I speak/work with, so I’m thinking this may have just been an easy excuse to reach out to me and he may not actually be interested in learning Italian at all. I have missed him when we weren’t in contact and I would like to talk again, so I don’t really know what to do.

He reached out to me after no contact for months, so why has he ignored me when I replied?
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