is it just a phase ? 😕

So my boyfriend and I have been dating since we were 16 (we're 19) on the 29th of this month it'll be our three year anniversary. But I'm starting to feel kind of distant idk if it's because of him or me. He doesn't do the things he used to like we used to talk on the phone a lot at night but now I have to be the one to call him and when I call him he always sounds like he doesn't want to talk. I've talked to him and he said that was in the past and it was just a phase ? I understand now we won't be talking much on the phone but I atleast want to be called once in a blue moon... maybe I'm just over exaggerating but I miss how our relationship used to be but he doesn't understand that he thinks I'm just being a baby about it. We're going to California for the weekend but Idk if I want to go because when I'm around him I'm just not really into him like that spark is just not there anymore, don't get me wrong I still love him but something is just missing idk what it is 😕