Signs a guy doesn’t want you to talk to you online?

Long story short I recently reconnected with this guy I studied with and we are talking online. He won’t initiate much but does reply fast to my msgs and sends emojis etc, in the past he showed signs of being into me and called me a few times ‘by accident’, would say how I would make a great girlfriend etc.
He found out I liked him but said he didn’t feel the same at the time, now I’m wondering why he’s all into talking to me…but we are friends I guess.
I straight up asked him to tell me if he didn’t want me to keep messaging but he said it was truly fine and to look after myself…SO I’m wondering what are the signs a guy doesn’t want to talk you online and is he just being nice?

Signs a guy doesn’t want you to talk to you online?
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