Mystifying behaviour from a new guy

[Surfer]

Sounds to me like he might just need reassuring - that you care. Some guys need to feel at the centre of your world in the same way some girls do. He might even think you are stringing him along IDK - just thoughts.

He may not even know what's going on - sounds a bit that way. Sometimes these feelings can come across as needy or perhaps some guys go 'man cave' to protect themselves (grumpy). I think if you are this early in the relationship, find a nice time together and talk to him. Say I have noticed this, I am not unhappy about it or about you, the fact I am here means I care, but would you mind really thinking about it and telling me what is going on with your feelings? Ask him to try and work out where it is coming from - whatever it is. Ask him to think about it tomorrow and respond in a few days but leave it there. Don't discuss it - make sure he thinks about it. Guys are really slow at thinking about their emotions at times.
Could tell him he expects 100% honesty, so do you. Build a foundation for your relationship. If he comes across as fobbing you off, you could distance and if pushes, revisit it until you feel you are getting to the bottom of it....

Just thoughts. Hope they help.

Surfer.