Re: His girlfriend!!
well this is a difficult one but...
1. it could be just a height difference or just a sign that he likes u
2. maybe you should just come out and ask him "do u really like her?" (he would probably say yes) and then come out and say" i like you and i dont know if you like me but i want to know"
now lots of awkward moments could come from that so think about if before you try it if you do