Why does he keep avoiding me when we cross paths on the same road and choose to turn around and take another road?

So, a few months ago, I joined a sports extracurricular activity. He and I are in the same extracurricular activity but he joined a few years earlier. We're in the same school and we met and got to know each other for the first time in this extracurricular activity. During my time there, he twice invited me to join the others to talk and get to know each other, once helped me set up the equipment I used for sports, offered to help when I had trouble with the equipment, and explained some things about handling the equipment. Lately, whenever he and I passed each other while walking on the same road, he always avoids me and chose to take another road. There was one time when we crossed paths while walking and if we had continued walking, we would have bumped into each other and he and I immediately refrained from continuing walking but his response was quite surprised, I mean before I continued walking, I knew he was there and I couldn't have just bumped into him. In addition, I also said goodbye to him and his friend to go home first. His friend returned my greeting but he did not reply or turn his head at all even though we were standing quite close. What was wrong with him? Did I do something wrong with him? I didn't bother him and we rarely spoke either. I just try to be friends with all of them...

Why does he keep avoiding me when we cross paths on the same road and choose to turn around and take another road?
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