Does he care more about her or like her than me?

I like this guy who is on s visit here.And well he is going back home in may.I have this idk how to call it.i guess some friend.And shes 1 yr older than me.SO i like this guy and he talks to me but i feel left out.One time she told me that he gets excited when he sees her and starts waving crazily.I got sad cuz it seems like he cares more about her than me.And yesterday they were talking and that today he will come over to help her fill out application for summer school.I was very disappointed.I probably annoy him or something.I dont.It hurts my feelings.To say the truth shes not that pretty shes fat.Lol.but i realized anything in love is not perfect.Im kinda worried what if he forgets about me?He texts me to come out of my room to greet him.Does he care more about her than me? :(