Is he playing me and trying to mess with my feelings or just nervous? What do you guys think (story is listed below)?

This guy I’ve been talking to for the past couple weeks has suddenly switched up. We met on social media through similar interests and didn’t know each other’s ages when we first started talking (M19.5, F23), this is said just for context. Anyways, we talk on the phone often & this past time, he tells me how much he likes me so much on the call (which was for hrs), talks about the future & then the next morning messages me “Hey, I think you’re really great girl, but I don’t think this is gonna work out. I’m sorry.”

We really like (d) each other and would talk all the time. He always says how lucky he is to be ‘a guy like him’ (nerdy, quieter, ‘not at his full potential’) talking to ‘a girl like me’(‘beautiful, kind, well liked, outgoing and a lot going for me’).

We got to know a lot about each other personally, likes dislikes, family things, life Philosophy questions, and we even talked about fun things we like to do together in the near future. He kept reiterating how awesome I was saying how refreshing it was talking to me, and I was saying the same about him.

This situation was alarming because a similar situation happened recently with him, when he said that he didn’t think we’re good for each other because “I’m a great girl & he has stuff he has to work on before he’d enter a relationship with me but he ‘wants to do this right’. We decided that will take things slower and still talk, but then he hits me with this statement out of nowhere. I can’t tell if he is feeling insecure, has emotional issues or if he’s playing mind games.

I never replied to the last message because I thought it was so rude that he’d say such a big statement to me like that over text especially if all was going well and we usually talk on the phone.
I really feel like it’s very indecent to text someone a message like that I have nowhere without explanation and after getting them hopeful for the future of the previous evening.
It’s been 3 days, and he just liked one of my instagram posts.
Is he playing me and trying to mess with my feelings or just nervous? What do you guys think (story is listed below)?
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