Guys, why would a guy use "HAHAHAHA" or "LOLll" in texts to a girl?

Anonymous
My friend likes to do this in almost every reply he gives. Note that he starts our conversations aleast every day, but he texts plenty of people from what he tells me.
E. g.
Me: I have extra class tomorrow nooooo
Him: HAHAHAHAHAHA
Him: Enjoy
Him: I have a presentation due tomorrow sigh
Him: can't wait for Monday to end lol

its not a sign of interest, is it?
Guys, why would a guy use "HAHAHAHA" or "LOLll" in texts to a girl?
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