Maybe he's just tired and doesn't want to talk or reply to your message.
The boyfriend is a Virgo. When I first started falling in love, it was almost a second, and then I slowly returned and became cold. I felt bad, too, but later he said that sometimes I really saw the news, but I just didn't want to return to inexplicable fatigue. I thought about it, not to mention Virgo. Sometimes I don't want to return to the news after a while.
So don't worry. It is normal to get to know each other, talk about it when you have time, and let him speak his mind.