15 year old, in dire need of love advice.?

Okay, heres the sitch. Theres this girl, who I'm quite sure I love, her names Halee, and well, shes totaly wonderful, whenever shes with me I feel like I can do anything. I'm suspended from school, but couldnt wait another day without seeing her, so i biked all the way to my school, just to see her as i bike by. She knows how I feel, but I dont think she takes it very seriously, maybe she does and shes just not interested, I dont know, heres my question. She has a boyfriend, and she feels happy with him I'm sure, or she would dump him. Now, I love her so much, that some times sure, when I see him hanging off her, I get a little upset, but I just look at her face, and when I see her happy, it just makes me so overjoyed, now my question is. She sometimes lets on like she kind of likes me, like, we kind of flirt together, nothing big, just hamless stuff, but, well, I guess I want to know if its worth persuing or not. If not how do I get over loving someone? tkx