Does this mean that he likes me ?

[Kinanti]

I have courses for 9th graders to prepare for exams (at indonesia , it's not the 8th graders that have final exams for highschool , it's the 9th graders)
And i like this guy there , he looks at me alot , and once , i came in late and he said "Oh here she is" in a kinda cheerful/waiting tone , i don't know if i'm just being sensitive , he is a really shy guy (or that's what i think , anyway) , does that mean he likes me ?

And i asked him to follow me back on twitter yesterday , but he asked "who are you" when he clearly knows ._.
is it because my twitter name uses my nickname and not my full name that i use at my courses ?

He isn't my friend yet , but i really want to get to know him better .
Does this mean that he likes me ?