How to ask a guy what's wrong?

hapa18
So I have this guy friend before he went on vacation he was really fun and out going and would sometimes sit really close to me or stand really close to me. He would wait for me before walking, and ya. Well, when he came back and we hung out it was the exact opposite, hardly any talking, putting lots of distance between us and would walk ahead of me and not even slow down. It was really awkward and I have a strong feeling I know why he was acting that way. Well I'm hanging out with him again and I don't know if he's going to be weird, but if he is, how do I ask him what's wrong? like how can I do it without pushing too hard but getting some answers so I don't feel so confused? please help.
Updates
+1 y
I still don't know what was really wrong the day that he was acting weird but I just hung out with him and he was pretty much normal, there were somethings that were different, but I figured that would be the case. Anyways thanks for the advice.
How to ask a guy what's wrong?
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