Is my boyfriend still interested in me?

Recently, I have been worrying that my boyfriend (who is currently also one of my best friends) is losing interest in being with me. I would appreciate any and all insight into what might be going on in this relationship as I have little experience in the matter.

We have been in a steady relationship since december. We have very good friends since Thanksgiving but didn’t give dating a whirl until the week before Christmas.

Basically, we went to see his family last weekend. Alot of things are occuring this week in my both with my family and with my job. I wanted to share my day with him and asked him to call me when he got a chance because I thought he was still at work. I texted him later on Wednesday evening and he said he had been off for hours. So I decided to give him some space. This morning and this evening he texted me ‘hi’ which I assume was a half-hearted attempt to initiate a conversation.

I haven’t talked to him for 72 hours now the longest we have ever gone without communicating. Thus, I’m somewhat concerned. Is holding out until he decides to call the best course of action? Are there more beneficial alternatives that don’t involve not talking. I’m extremely lonely and in a new place and have very few people to talk to besides him.