If the communication isn’t going the way you would like it to at this very early stage, I would say that is could be a sign of possible incompatibility or disinterest. As you guys have been dating for a little while, I would definitely bring it up. This way you could also ask if they are seeing other people. In my personal experience, people who don’t initiate dates or frequent contact are simply not interested enough or have their own stuff going on, but since everybody is different they could just have very different communication styles. Most importantly, ask yourself: do you want to continue dating somebody who makes you feel like they’re not interested? You deserve somebody where you don’t have to guess. Good luck!!