Could he be lying?

I asked my ex (whose like a good friend now) if he would be dating anyone else and he took forever to respond to it but eventually said he forgot to hit send but said that he's not planning on dating. He apologized for forgetting to hit send.

But I wonder if he forgot because he really wasn't sure. He's never lied to me and I don't think he would start now but I don't know.

As a guy is this a way to keep a girl locked down? Like in her backpocket or was he truly being genuine?
Could he be lying?
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