Need help with my girlfriend?

Long story short I asked her out and for 3 weeks we were going pretty strong all happy and what not. were 14 and even though people might say im too young to really know what love is, screw that im going to say it anyway. I LOVE HER and im so appreciated to have her in my life just seeing her smile makes my day. On our one month an i got her a really nice necklace and we were just so happy. shes the first girl thats really stuck to me shes just amazing and we have boatloads in common its scary shes perfect in my eyes and shes so funny every day i wake up and just smile at how lucky I am. well there was a dance at school I was going to take her to so she sent me a picture of her dress. Her dress covered her up enough to be presentable any where but i showed one of my buds and he laughed for a reason god knows what he must have noticed something. So the next day he tells her instead of me and for like 3 days she was sad and i heard she was crying had to call up her mother and ask whats wrong to get the answer, so i talked to him and he felt really bad about it and stuff and one of her friends likes me too so she says stupid things that hurts her and i thought i took care of that too. then what i thought was normal really wasnt. shes always saying how i can do so much beter then her and shes just sad and i have no clue why. Me and her mom have came to an agreement that she is on her period and is just a little moody. But like today i asked her i feel like your not the same since that thing with my friend. are you ok and whats wrong? shes just so sad. and shes always saying now if you dont like me then just break up with me. I love her to death and she needs to know that and just aggh! today i told her the real question is do you still love me and do you still want to be together. she started crying and said idk. I have no clue what to do idk if this is all her period acting up or if its our "friends" or what im so paranoid! what should i do whats ur advice?