Why did he lie about watching a show I was interested in?

There’s this guy I was talking to about a show I was currently watching when he asked what I was up to. After I told him he said he was surprised that I’m into soap operas. He then asked if he should check it out and I told him yeah and told him what streaming service it’s on.

The next day he told me he checked it out. I was excited so I asked him which episode did he watch to start up a convo. He then tells me he watched 10 episodes but couldn’t explain to me what happened in any of the episodes. So I shrugged it off and asked about a character who had a main part in one of the episodes and who’s been on there for awhile now. He couldn’t recall who I was talking about so he asked what season was I on. And since it’s a soap opera, they have at least 50+ seasons and I told him I’m on their recent episodes since I’m caught up (Been watching since I was a kid).

I explained that to him that the show came out since in the 60’s and they only have recent episodes from this month. He then says “Oh yeah I’m on the older season. I watched it on a secret website”

After that I just left it alone. I didn’t wanna accuse him of lying or bringing it up, but why would he say he watched it when he clearly haven’t? And on top of that he couldn’t even explain any storyline of the “10 episodes” he watched.

And I know it’s not a big deal but I take lying seriously, even if it’s something small because he didn’t need to tell me he watched the show when he didn’t watch at all. I don't know if he thought I’d be more interested in him or what but it made me distant afterwards.

Why did he lie about watching a show I was interested in?
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