He called me at 2am; why?

So, the guy I've been dating for the past 5 months called me at 2am to talk about our relationship. what's up with that?

Background: Valentine's day he text me early in the morning to wish me happy Valentine's day. I replied back. He didn't call or come to see me. We're 2-1/2 hours away LDR. However, he calls me at 2am and I woke up from the call so we spoke until 5am. We had not spoken for the past week other than txt. I called him a couple of times and he didn't pick. So, why call at 2am to discuss and tell me he misses me? It's puzzling. I'm not sure what his deal is..
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And I mean we had a full 3 hour conversation talking about our lives, relationship etc. This wasn't like a drunk phone call of lets meet and have sex.

So, I'm really confused. Can someone shed some light?

Why not pick up the phone and talk about it on regular day hours but have convo at 2am..?
He called me at 2am; why?
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