Guy with long distance relationship is flirting with me? Help!

Anonymous
I've known this guy for a little over a year through mutual friends. He's in an ldr with a girl in Europe, so he only sees her on breaks (we're in uni). He never mentions her when we talk. We study together for 4 hours twice a week, and he'll joke around and nudge me a lot. One time I thought he was staring past me when I was looking at our practice problems so I said 'distracted by the coffee?' and he said 'no I'm just looking at you'. I brushed it off with laughing. It was getting late and we finished studying so I said I had to get back to my apt. He was going to stay at the library but he said 'nah I'll walk you back so no guys creep on you' and walked me until a block away I said I could walk the rest myself, then he texted me asking if I got home safely 5 min later. Is he just being nice /friendly? I would go for him but he's already in a relationship. Is it okay he's acting like this or should I speak up? Thanks!
Guy with long distance relationship is flirting with me? Help!
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