Guys, Why would a man start slowing down his walking pace as he saw me coming on or walking beside him?

Thsi guy in my college class was walking infornt of me and then when he turned his head and saw me I ntocied he slowed down his walking pace abit and then I ended up walking ifnront of him cause I needed to be somewhere so I was quite focused on where I was going. I just thought it was weird, subtle but weird. We've been in the same college class for 3 years, we're not friends but we've spoke a couple of timee and are friendly with other in terms of the occasional greetings.

Guys, Why would a man start slowing down his walking pace as he saw me coming on or walking beside him?
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