I need guiding

I will try to explain my situation in general. I feel like my friend is not very interested I me anymore. She is really important to me so I always try to be there for her and I feel like she doesn't care as much. I have told her that I don't like how she is being colder, leaving me on seen and never asking to hang out unlike me, but she says it's not a big deal. That makes me feel even worse. I try to act the same on her, ignoring her and stuff but that make me feel horrible bcs eventhough her behavior makes me mad or sad sometimes I don't feel it naturally to treat her like that