<human>: Give me the gist of the text in a nutshell

I have been talking to a guy on and off for around two years now and I have noticed a trend in our communication. 

When I try to make conversation, he will answer my question but he won't ask me anything back so conversation dies quickly because it's one way, always. When I stop talking to him for a while, he will message me and talk to me a lot for a bit and then become cold and uninterested once I give him attention. I know there is a mutual physical attraction and a silent acknowledgement that we will never date because of distance, but I'm not even interested in that. I just want to be friends with him and I'm pretty sure he knows that. 

I know it's quite vague, I tried to make things short, but what is going on here? I can try to give more info if needed. Should I pursue trying to be friends with this guy or just let whatever this is go on like this?
<bot>: Guy talks to me a lot when I don't talk to him, when I try to make conversation he will answer but will not try to make more conversation.