Long distance

So my boyfriend and I met on a cruise in the summer, and we’ve been dating for five months. He lives in California and I live in Utah. Everything about our relationship has been great, until recently.

He hardly ever calls or text me, even when he does text me he usually just says goodnight and then leaves me on read. We hardly call anymore and even when we do we end up only talking for twenty minutes at the most.

I just don’t know what to do. I just feel like he is starting to lose feelings for me. I feel like we talked more when we were friends. When we were friends we’d stay up till two am on the phone. But now I’m lucky if I get ten minutes to talk to him.

Any advice???