What does it mean when a guy goes out of his way to say hi?

OK so this guy and I aren't really involved..we sleep together sometimes,but that's it.

Well today we happened to be going to the same place and I guess he noticed I was following him afterwards(I was going to my house)and so he stopped in front of my house:o so I went around and parked my car. I thought he was going to come up the door but he didn't. Finally,when I didn't come out,(I had to walk through the house to get to the front. grr)he left!

I then sent him a text asking him if he wanted something,he said no.

So what was that about? Did he come all this way just to see me?

thanks for your input.
What does it mean when a guy goes out of his way to say hi?
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