Guy friend is being too cold with me after I sent my vacation pics and I dont know why?

Guy friend had been sweet prior and helped me overcome my panic attacks and anxiety. He was very caring and helped me to be okay. He is also consistent in sending me messages asking how i am whenever I deactivate my fb.
He even created an excel showing the things i should eat or not eat.

I went on a vacation with another guy bestfriend for mental health and went to a resort. After I reactivated my fb, 30 minutes later the guy sent a message asking how i am. Because I was really busy, i sent him a message 6 hours later and told him my issues and also that i went surfing to overcome my issues/problems or destress.

At first he responded that it sounds good and that it'll help me destress but when i sent my pics. The pics only shows me. He did not comment at all on the pics and was brief on his responses to the other topics and sporadic on messaging. I admit i was sporadic on messaging too because i was traveling.

But lately he has been too sporadic with his messages, sending short messages, replying a day later or several hours and it's totally not him. We used to have a back and forth type of messaging so this is new.

I wonder if i could have upset him? But i dont think he should be upset. What do you think?

Guy friend is being too cold with me after I sent my vacation pics and I dont know why?
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