Me and my girl were in love now what happened?

me and my girl were in love legit we would stay up late at night tellin each other how much we love each other and now i dont know what happend one day when we were talking as normal i said i love u and she said sorry she just wanted to be friends and i know she wasnt creeped out or anything when i said it cuz we always do that to each other she said that there was a lot of stress in her life right now and that tthe guy who she liked before we met likes her and shes really confused what can i do to get her back please help