We've only been "dating" for about 5 to 6 months now? And I know that it is a bad sign if we're already having minor issues like this.
To be fair, I was only 5 month with my boyfriend, when he started to act exactly the same, as yours is right now.
There must be a reason why he does that. You need to get to that reason, sit down with him and really speak about
everything. Trust me, it helps a lot.
For my part, when he acted more and more distant, at this time I had a very good online friend, that started to kinda
"flirt" with me and he was so much more nice to me, than my actual boyfriend. I felt more loved from a random online
guy than my actual boyfriend. However, my boyfriend never really takes me serious when I say "We need to talk",
but I made him clear, that this had to be a real talk. So we sat down, I told him about everything, he started to open up
as on why he is acting like it and we figured everything out.
Fast forward, we are now 4 years together, he just bought a house for us and we are getting even more animals (like 7 are not enough.. to be fair, it's my fault the amount of animals :3)
So don't give up that easily, speaking works wonder