Just wanted to rant

My girlfriend broke up with me just after Christmas but I tried talking to her and we got back together so the break lasted for about 3 days and we got back to normal but I put in a lot more effort into our relationship and we were both happy, she was smiling and having fun with me but lately she suddenly returned to the attitude she had before when she was broke up with me so I asked her if anything was wrong and then she broke up with me again. I tried pleading with her but she said she made up her mind. She said she no longer sees the future with me and the worst part is, she said all of her smiles and our fun times this past few months were her pretending that she loved me but I can't seem to believe that. I told her I'll still be waiting for her but I just don't know what to do. I don't know what hurts more, is it the part where she's leaving me or the part where she says all of our memories were her just pretending to love me.