I don't understand, what do I do? Help?

So this boy I've been talking to for 3 months or so and I hit this weird patch. We've stopped talking for a month until he finally came around, making me believe he'd be around for good, only to find out he'd stop texting me for another week or so. He texted me yesterday but nothing was the same between us. We used to have the cutest conversations and out of nowhere, it's like we're just meeting each other. A week ago, he explained to me he still felt the same way towards me (he really liked me) but he's constantly MIA and the conversations aren't even worth having anymore. This is a long distance thing too. I'm not sure if I should just not respond when he texts me or try and hash everything out between us. I honestly don't know what to do about him...