How much do you really know about him and his life? Have you tried asking him why the change?
First, only he can tell you what he is thinking or feeling.
Second, you have only known him a month and you have only been talking on-line (or have you met in real life?) A month isn't very long in getting to know someone. What you are seeing as being distant may be him being caught up in his everyday life-work, school, family, friends, etc. On the other hand, there is the possibility that this is his usual pattern of behavior. Start heavily invested in the 'relationship' and then drop it once the chase is over.
I suggest putting the thoughts of being more than friends on hold for a while. Go about your life and don't put all of your hopes for a relationship on this person until you get to know him better over the course of several months. Pay attention to warning signs that he may not be who or what he says he is.
I won't say to drop him because he is a bit distant because it may not be his choice. I am not going to jump to the conclusion that he is married and looking for fun or a young teen trying to be more mature than he is. But I am saying to hold off on giving complete trust until you know him better.
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