Am I worrying for nothing?

The guy I've been casually dating for 3 months has been distant the past few days. We hung out on Tuesday, spoke briefly on Wednesday. I haven't heard from him since. I sent him a text on Friday early afternoon, but didn't get any response. So, my good friend who is also his friend sent him a text message Friday night to see if everything was OK. He texted her back immediately and said he had been really busy at work and helping take care of his 2 nieces while his sister in law was in the hospital (hysterectomy). Anyway, she just told him I had been worried about him because I hadn't heard anything back. He told her "I'll talk to her Saturday, for sure." Well, I didn't hear anything from him Saturday either. I'm not going to send him anymore texts or anything since he didn't text me back and because I don't want to pester him. What would you do at this point? Does it seem as if he's blowing me off or just has too much going on? Thanks to all who help - I appreciate it. : )