Why is he doing this?

I love him and he loves me but our relationship is long distance. He claims he's busy and reads my messages i've sent but get's back to them hours later, yet I can tell he's been all over social media. His messages he replies with are very short and almost always saying sorry i'm busy... we'll talk tomorrow I promise. Then tomorrow rolls around and we don't get to talk. What's going on here? He cut's our talk time short and when we do talk he's not fully present in the conversation. I was finally so happy for the first time ever in a relationship and then this happens. I don't get it. Maybe he's fallen out of love with me and doesn't know how to say it. I understand people get busy but I don't understand this.
Why is he doing this?
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