Plz help me bc i dk what to do i love this girl she loves me but there is something wrong what do i do?

ok this girl i have falling very very very hard for i mean i really love this girl told me she loves me to but were not dating or anything. we have known each other for a long time but i mean i love her so much and she sed she loves me but she has a bf that means the world 2 her i dk what to do it breaks my heart that i love her so much and i cant b with her you see the thing is she has been going out with him for over a year and she truly loves me and i mean i have it bad for her but she likes this guy and he tries to control her like he tells her who she can and cant talk to and were she can and cant go and stuff like that but she texts me all the time and shell hang up the phone with him just to text me and he actually bot her a ring not like engagement ring but ya and she thinks shes gana marry him but she tells me she loves me and ppl tell me to move on but i was sitting with this girl at church the other day and she was talking to me and messing with my hat and this is youth by the way and she cried all through youth bc that girl was messing with my hat and all bc she likes me and i dk bc if she stays with him and crys every time im with someone what do i do i mean i love her more than any girl i have ever met and i dk it is eating me alive bc he don't deserve her at all i want to tell her but i dk if i should im 14 by the way ill b 15 in a month i really need help and they fight all the time and he really upsets her but she tells me every day how sweet i am i tell her every day how important she is to me every day i tell her how i feel i always make her day better when i talk to her i know bc she tells me and i just dk what to do....AND IM NOT TO YOUNG TO KNOW WHAT LOVE IS STOP SAYING THAT U STUPID PPL AND SHE DOSENT LIKE ME AS A FRIEND SHE REALY LOVES ME TRUST ME SHE TOLD ME OK MY GOD U PPL MAKE ME SO MAD ACTUALY HELP INSTED OF INSULT ME