Am I just overthinking things?

My boyfriend and I have been dating for almost 2 years now. He was deployed for a little over a month now. He's leaving me on read or just responding with 1 or 2 words or emojis. He'll send me memes on Instagram or fb. He called me a few times for a 5 minutes. I knew deployment would be hard but am I just overthinking how distant he's been?
Am I just overthinking things?
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