How should I let him know he's not off the hook?!

How should I let him know he's not off the hook?

So this guy- we used to like each other, and when he was walking with his gf, he pretended like he didn't even see me. He commented me today on myspace, "Hey whats up LL, what are you doing?" And I just replied "I'm just sitting here bored... you?" and he didn't respond, and I know he saw it cus he was talking to other people.

Now he thinks that it's ok that he ignored me. I know I shouldn't have commented back, but what should I do now... besides just telling him?

3 days ago
To make it clear:

HE commented me FIRST
THEN I commented HIM

... after that he didn't comment me

3 days ago
I am actually mad about him ignoring me in the hall

be like if you want to have a conversation with me HAVE A CONVERSATION WITH ME. don't ignore me.

I HATE HATE HATE when I message or comment people and they do not respond.

It really ticks me off!

if he acted liked he didn't see you when he was with his gf than he's just a rude person OR maybe his gf has issues with you OR maybe he doesn't want to make it look like he's checking you out....

guys are dumb....I think we can all agree on that.