I have a girlfriend, but i don't think it would last?

Hi, i am 15 years old and i recently got my first girlfriend 2 weeks ago. I been talking to her, and i am falling in love everyday i see her. She says how she won't be able to see me in the summer time that much because her parents are stricted and she works on the weekends. She also thinks i will brake up with her as soon as possible because of this, but i like her so much that i think shes a keeper. I think she will be a keeper, and i know she loves me a lot and thinks ill be her keeper. Also theres this grade 11 guy she says bothers her and talks to her on msn but never at school, oh how he likes her and sutff like dha. And im scared if she likes him and is gonna cheat on me or play me, til we brake up ndd go with him. I NEED HELP!?!?