Relationship help not sure what to do?

Hope I can help a little. I have a long distance relationship too, and, though we instant chat every night, I've had times where I've hardly felt like we're a couple, and felt distanced and withdrawn. He's been really understanding about it, and we get through it. From the email, it shows he still really wants you and loves you, maybe it's just the being without you so much that must be getting to him. I can't know for sure of course, but I don't think he's trying to break up with you.