I feel like he's ignoring me, and I don't know why? Help?

My boyfriend left my place a few days ago, and I sent him text messages telling him about the things he left behind (DVDs and clothes) but he never replied. Usually he would call and ask about it, but he hasn't even done that. I also sent him messages asking him how he is, and he hasn't replied to that either. I don't know whether he's lost his phone, or is ignoring me. He hasn't sent me any messages on facebook either, which is strange. What do you think? Is he ignoring me, and has he just lost his phone or something?