Is He Losing Interest?

This guy that I’ve been talking to has suddenly stopped texting as much and his responses have become a lot drier. So I asked him if everything was okay between us and he said that he’s just been really busy. He used to apologize if he took more than a few hours to respond and we’d have at least one good conversation about anything each day. I am not the type of girl who needs to be constantly texting my man but it’s gotten to a point where he’ll send one text a day and I won’t hear from him until the next day. If I call him, he’ll talk to me for hours but it would feel nice for him to call for once. He used to initiate the phone calls all the time and now I feel like it’s just me. There’s just a lot of mixed signals. I keep thinking about the thing that people say that 3 months is the amount of time it takes for a guy to either drop you or continue seeing you and we’ve been “together” for about four months now so it’s around that time. But even though he’s been acting weird, we still talk about our future together. For example, I’m moving into my new apartment soon and he literally was like let me get the address so I can see how far it is from my place and asking me if I’ll keep his favorite snack for him, and planning on like what we’ll do once I move in. I feel like I should not respond to his last text and just give him his space for a few days, let him reach out again if he truly wants to. Before, if I didn’t respond to his texts, he’d end up double texting me because he couldn’t go more than a day without talking to me. I just feel like things are changing but I don’t know, I could just be overthinking. Let me know what you guys think if I’m overthinking and if I should give him his space for now? Thanks!