Is my penpal flirting with me or just being a nice guy?

I have a penpal from UK and we've been chatting online for months. He usually mentions that i look very pretty and cute and yesterday he said he'd definitely ask me out if i was in England. I just laughed cause i wasn't sure if he was just kidding. Then he called me his girlfriend and i think he was kidding about that but still not sure 100% So what do you think?
Is my penpal flirting with me or just being a nice guy?
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