A good way to figure out if a guy is interested in you or not:
Casually figure out a way to meet some of his friends - if they say "oh, YOU'RE Yeti? blah blah blah"
That's either a really good sign or a really bad sign.
So....I guess you still won't really know if he's interested - but at LEAST you'll know he's talking about you.
You're welcome for the helpful advice.